All-Vans Quality of Life Patches for Fall and Winter; Going to the Jalopnik Car Show, and Infectious Vantruck Disease

Winter is literally coming. As time goes on, my ability to work on vans decreases greatly both for lack of daylight and lack of inside matters. In preparation for overwintering now two  vanbabies, I decided to make some repairs and mods that were becoming more necessary (or more necessary, if you get what I mean…). I like keeping my machinery in good functioning state, and Mikuvan was beginning to feel a little like a daily junker more and more. Meanwhile, Vantruck had some lingering bugs I wanted to address before my hands freeze off holding a wrench.

mikuvan

The most important thing was making sure Mikuvan could still pass its incipient Massachusetts state inspection. You see, since the day I got it running in 2013, the exhaust has been slowly shortening itself piece by piece. Recall that one of the earliest bits of mechanical work I did was to rebuild the catalytic converter flange. A year and some later, a part of the exhaust pipe broke apart, which I had a mechanic repair while it was on a lift already for a brake fluid change and rear drums inspection.

That was 2015. About a year to the day, before Dragon Con 2016, it breaks upstream of that repair. I threw together this patch in my classic weeaboo-redneck-engineer fashion

No beer cans here, only top quality RAMUNE BOTTLES. Three layers of them.

Several months later, that broke off, so I trashed the whole section from the bottle-hack back and replaced it with a 90-degree downwards bend with an exhaust tip on it, hanging on to the remaining muffler stub.

Well guess that, that broke the fuck off earlier this year, likely during the Detroit Maker Faire trip. I didn’t notice. I didn’t even care. It can rest in eternal pain and suffering somewhere on the side of the 401 in Ontario.

I just ran with the stumpy pipe out of the muffler which terminated well under the cabin, sounding vaguely like a ricer fart cannon but offering me nothing except exhaust slowly seeping into the cabin when I was at a stop or accelerated hard.

With the inspection date coming up, I had to do something.

Ah, good old New England Organic Loctite. It occurs naturally, regenerating from any exposed worthwhile metal in its vicinity. In the winter, it feeds off the gazillion tons of salt poured on the road and blossoms each spring.

I’d watched the catalytic converter slowly get smaller and smaller over time – even the new gasket I put on it quickly became one with the material. I actually dumped PB Blaster on this flange connection while it was still hot – that was quite exciting. It then took several seconds of impact wrench before I was able to free the converter bolts. Frankly, I was amazed they were removable at all.

Since Mikuvan is emissions-exempt in Massachusetts, I elected to not buy a new catalytic converter and just latch right onto the downpipe stub.

 

Time to measure up the exhaust path. I needed to clear the rear axle and end up at roughly the correct length to still put a muffler on. I decided to rear-mount the replacement muffler (which was also already rotted out at the bottom, so it wasn’t doing much muffling for a year or two at least) instead of mounting forward of the rear axle like it was before.

 

And two trips to Pep Boys later, I have all the ingredients! Several lengths of pipe, a flexible coupler, several rubber-mounting hanging straps, and a bunch of tubing adapters. All that is needed to get the right dimensions is an angle grinder!

What, you thought I was going to weld this shit together? Mandrel bends? Mitered joints? Nah. Clamps and impact wrench all the way.

It’s nighttime in this photo because I ran into issues with the downpipe stub – it was some odd metric size of course, and there was no adapter which fit cleanly either inside or outside. I ended up using a 1-7/8″ OD adapter slit and shoved into the downpipe stub, which had a matching slit to let it expand a little. It was then a dance to get the other end of that adapter (2″) adapted to 2.25″ for the remaining pipe. All of the new pipe is 2.25″.

Yeah, the slit is a built-in exhaust leak. Whatever, it’s past the oxygen sensor. Maybe if I feel enterprising I’ll TIG weld it shut (and ONLY it) later.

This section has a flexible coupling in it since the catalytic converter’s output also did, and I wanted to keep the same constraint architecture. The length of solid pipe from here back is hung at both ends while the flexible coupling goes from the adapter salad to it. Should I be required to reinstall a converter in the future, like moving to an emissions-strict area where they don’t just go by OBD-II diagnostics, I should be able to stuff one back in here.

Compared to the… exhausting… dance up front, doing the up-and-over was quite easy and enjoyable.

I decided to be cheeky and go for a SPORT MUFFLER instead of an OEM style one. What, you wanted to sound like a sports car all these year, Mikuvan. Here’s your chance.

This is a Cherry Bomb “Turbo” multi-chambered muffler, distinct from Cherry Bomb’s usual fiberglass packed ones. I don’t have a turbo. I don’t care. It was $28.99 on sale at Pep Boys, and a little of on-the-spot research told me that glass-packs would definitely bring out the ricer fart cannon sound, but would foul up quickly due to the engine consuming oil. Given that,  I was better off with a chambered type.

Anyways, this first attempt made it hang a little too low, so I had to cut the strap and bolt it in closer to the trailer hitch.

The final position. It’s not actually tilted much in real life, by the way – the perspective of this photo is a little strange, since Mikuvan’s rear lower quarter panels curve upwards and the trailer hitch is actually a little tilted upwards also.

So, how do I like the end result?

i regret everything in my life

Okay, the ricer sound was funny for about 24 hours. Between 1000-1500 rpm and 2500-3000 rpm, it seems to resonate the cabin, resulting in a constant mooing sound, a persistent droning. Guess which RPM bands get used the most during gentle city and highway cruising!?

Mikuvan sounds like it has 75 more horsepower than it actually does, which is a 75% improvement. It DOES have more low-end jumpiness, like the second after mashing it from a stoplight. Additionally, the power available past 3500 RPM improved noticeably – previously, trying to throttle past 4,000 didn’t do me much good, and it felt like the engine just hits a wall, but my gas mileage the week after took a complete dive as I was redlining everywhere all the time.

I think this is less due to a sport muffler than just installing the new system as 2.25″ pipe instead of the stock 1-7/8″ (50mm?) pipe for its majority length. I didn’t bother to check if the 0-60 changed. That’s not the point. The answer is still yes.

Realistically, I might toss an OEM style muffler on there after winter passes.  One Dragon Con and Franklin Institute with the Persistent Moo was fairly sufficient, thank you.

Anyways, let’s move onto the more important part of van maintenance: blinkenlights.  I replaced almost all of the small marker and dashboard lights with LEDs back in 2014. A few of them had begun dying, including somewhat important things like the previously chastised oil pressure warning light. That’s maybe a little important.

inexpensive chinese van lighting 3: the reckoning

I decided that enough time had passed to do a scan of the market again, so I hopped on good ol’ Amazon Prime. The market structure™ is very different now – in 2013 and 2014, a lot more of the LED widget vendors were China based. Nowadays, they (or their underlings) all have Prime fulfillment or US-based shipping.

 

 

What I noticed is a rise in these purely PCB-based LED units in small (T10, T5, 194, etc.) sizes. I originally bought several styles which were plastic former incandescent lamp shells containing discrete LEDs with formed leads. Those actually didn’t work very well in the end. The LEDs had no heat sinking and tended to burn out or dim quickly, and the formed leads pretending to be T-series shaped were flimsy.

Also, a lot of the LED clusters were unnecessarily bright, containing 5-10 devices. It’s a marker light, bruh, not a camera flash. The ones I found contained 3 or 4 little LED chips only and seemed to have a lot more PCB copper area relative to their size. An example captured from Amazon is bove.

I was curious about one more thing: Most of these products now claim to have “CANBUS error-free” features. After doing a little sleuthing, I discovered that it’s a New Car Problem (a.k.a I don’t care) of the LED bulbs drawing so little current that the ECU/Body control module will throw an error saying you have a bulb broken.

….so here is how the enterprising Chinese widget makers solve it. They drop a big power resistor across the input. To make it draw more current.

This is utter bullshit. Do not EVER buy a “CANBUS Error Free” LED bulb. If your car is new enough to complain, it’s new enough that you shouldn’t be putting questionable aftermarket glowy things on it anyway.  Get an old shitcan like these were meant for. Preferably a van. I like vans.

Here is what the typically 100-to-200 ohm power resistor does: It heats up.

It heats enough to some times desolder itself.

It’s also right next to the LEDs, so they heat up even more and even faster than if they were over-rated and over-driven. I burned one out on 14.0v after like 3 minutes of it just sitting on my desk. It was drawing 0.2 amps until the end – that’s 3 W of power heating up an object which weighs nothing. I think I know why so many of these products have bad Amazon reviews: sadly, people don’t know better.

I desoldered each and every “CANBUS resistor” on each and every one of the 50 white, miku blue, red, and amber LEDs I got. This did not take long, since I had a reflow cannon, but I was peeved to discover that my worst fears regarding inexpensive Chinese van accessories had come true again.

The white T10 units drew 0.05 amps after I was done. That’s more than enough.

The end result is real pretty though.

I changed the master illumination to the “ice blue” LEDs which is really clever marketing speak for my favorite color, Miku Blue.  I also restored all of the small indicators to pure white units so their original colors were back.

That’s enough for silly lighting. It’s still the case that if you want actually reliable LED units, you should still stick with a retail brand name like Sylvania or Philips. They’re going to be pricier, but unless you also have a reflow heat gun and a night to burn and are at least a little obessive like me, just get them.

More recently, I tackled a more reasonable silly old van problem of a broken sensor wire. While doing the fall-to-winter oil change, I noticed a loose wire.

This used to go to the oil pressure sensor (what is with the oil pressure sensor and light as a recurring theme here…) which is located on the bottom of the engine. Heat and oil had stiffened the old PVC-insulated wire until it just broke off inside the connector.

This wasn’t too epic of a fix. I replaced the original wire with a length of silicone-insulated noodly robot wire, up to where it enters the harness and was still quite flexible. This shows the joint and repaired connector before I sleeved it over with heat-shrink tubing and tucked it back into the wiring loom.

Back in place we go!  Excuse the grunge. That is Mikuvan leaking the correct amount of oil my self-applying undercoating system.

I additionally performed some mercy maintenance on the left side. My original body repair on the left rocker panel corners fell off earlier this year. I was kind of expecting this, since I was never able to get the holes in the front (behind the front wheel) fixed and so that repair only trapped water, causing it to fail eventually.

I decided it was better to just leave the lower panel holes open but seal-coat them inside and out. This strategy had been working (and continues to work) for the two holes forward of each wheel, which I coated in Eastwood Goo back in 2014 thoroughly.

So out comes the wirebrushes, in wheel and tooth form. I wire-brushed off all outstanding surface rust first, and reached into the panel holes to manually wire brush off the loose rust inside. Additionally, while I had it up on ramps, I used my slide hammer to try and pull down the damaged lower rocker panel and pinch weld. If you buy a derpy Japanese van, chances are someone’s tried to jack it up by the pinch welds and completely fucked over the metal in the area, I guarantee it.  I only take Mikuvan to mechanics I have talked to and trust for this reason: I don’t trust anyone to know it can only be jacked by the frame. This area came rusty and bent upwards, and had only been deteriorating more. I couldn’t get it completely flat again, but it at least looks better than it was.

Prior to the application of Eastwood Goo, I touched up the paintwork right next to the fuel filler door and immediately in front of the rear wheel. The former had been slowly dissolving due to gasoline fumes and accidental overflows, and was turning the whole area dark and ratty looking as well as causing some of my original bodywork to start chipping off. If I had to point to one thing which crossed my “daily junker” threshold, it was this. I haven’t found a rattlecan product which can completely resist gasoline, so this area will only become ratty again until Mikuvan gets a real paint job.

After the color and clear coat were vaguely dry – as dry as they could get in 40-something degrees, I drew a big fat line with the Eastwood Goo both on the outside here as well as the opposite side, using the extendo-straw to go well into the interstitial space of the panels on both sides.

Essentially I’m just preserving this area from further deterioration. Should I decide that dropping several thousand dollars on a full restoration and repaint is worth it in the future, I will source this body panel either domestically from the southwest/California, or internationally since this generation of Mitsubishi van is still (somehow) in production in various developing countries. Otherwise, an experienced body shop would just strip it all to bare metal anyway. Should I embark on an electrification project, I’ll likely start anew with a donor van in better condition from the same areas (since I assume that if I’m going ahead with cutting up Teslas and Nissan Leafs, that I’m well off enough to have my own garage and lift!)

So that’s Mikuvan’s history for the past 2-3 months. Interspersed with all of this was of course the comparative 800-lb gorilla and relatively white elephant of….

vantruck

Oh god why do I still own this device. It’s been a year, yet it still feels new and interesting.

As I had sampled a pile of LEDs again, one of the things I did immediately was to retrofit Vantruck too. The incandescent bulbs it came with have long darkened and were sort of miserable looking. The dashboard was so dim it was almost impossible to see even at night.

 

Well that’s no way to live! Luckily, it uses type 194 bulbs EVERYWHERE. Even the idiot lights. I had to buy another pack of T10/194 type LEDs to satisfy it. (Vantruck is the undisputed king of the phrase “I had to ____ another ____ to satisfy it”)

Naturally, all of the dash illumination went Miku Blue. This was also taken before its 77777th mile party, celebrated by Dane on the road to a Power Racing Series race. Without him realizing it. Hurray, Dane!

By the way, my friends have put more miles on this thing than I have. Since the fuel injection retrofit, it has somehow registered no less than three trips to the New York / New Jersey area and one to southwestern Massachusetts, plus the odd DUDE BRO CAN I BORROW YOUR TRUCK BRO moving trip around town.

I don’t feel bad at all. Buying gas is punishment enough for them.

Along with the interior lights, I also redid the running board lights and forward exterior marker lamps. They were….. you guessed it. 194 type bulbs. I changed the “I am a van” lights by the door handles to Miku Blue since I’m Mr. Vain. It turns out that the bed marker lights are a sealed non-replaceable type, but I can get new ones which are all LED. I haven’t done that yet. I didn’t do the roof lights either – they are fastened from underneath, meaning I’d have to take off the roof liner to access them, which I was not inclined to do.

Notice something else cool? Vantruck now also has LED headlights. They are the same type of unit I got for Mikuvan, except in the H6054 size. They are available in all manners of Chinesium – here’s one example. Just search H6054 LED and don’t buy the 15,000-LED cluster bombss or the fake projector types.

After the LED switchover, I noticed a particularly Vantrucky bug becoming much worse – the lights were flickering hard. LEDs have no thermal mass unlike incandescent filaments. Something was causing all of my lights to flicker, including the dashboard. When this kind of thing happens, there is generally one culprit: a bad ground connection. I dunno whose amazing idea it was to chassis-ground automotive electrical systems, but it’s horrible.

In conducting a test to verify the problem, I connected one end of a voltmeter to the negative battery terminal, and through an alligator clip of sufficient length, to various “grounds” of the electrical system, such as the negative pole of a headlight, the body metal right next to the dashboard where a bunch of grounds for switches and knobs come together, and right next to the battery on the alternator. With the engine running, I captured an incredible 1.2 to 1.5v between battery ground and most things. The worst was, as expected, to the dashboard and interfacing with the body lighting harness in that area. (The correct expectation range I found is usually no more than 50-100 millivolts, and the lower the better just from my electrical engineering intuitions)

Holy crap. Well that explains why the FiTech ECU screen always tended to read my battery voltage as 12.something or 13.something. I verified that from the alternator output to itself I was getting a pretty consistent 14 volts.

The culprit was right behind the alternator – that’s the engine block to battery negative ring lug. I don’t have before photos, but let’s call it “rather pitted and sad looking” and its attachment bolt entirely coated in rust.

My solution was just to epicly wire brush the bolt and the attachment face until they were shiny, and crimp a new terminal onto the 4-gauge cable which was still otherwise in reasonable shape. After retightening, I smeared dielectric grease around the entire setup.

I decided at this point to also give the thing new battery terminals which I had purchased a while back but not installed. I furthermore gave the body a dedicated 10-gauge wire running from the attachment point where (as far as I can tell) the headlight and turn signal harness is grounded.

So I’m not sure if this is an Old Van Problem or is still present in newer vehicles, but it seems strange to me to ground everything to the body and frame yet only give the battery a cable to the engine block. Is the return current supposed to find its way back through to the engine block, jumping through things like bolts and bearings and chains and driveshafts? That just seems extra bad.

I mean, it’s clear there is enough metal contact for it to work for most everyone. Even Mikuvan only has 1 epic ground wire going to the battery from an anchor point on the engine block and nothing else that I can see. Unless I’m missing something, it seems like a dedicated ground wire for the body is really beneficial. It could be that in both cases, there is an actual connection somewhere else on the block to the body, but it’s buried so far in there I have not been able to find it.

Anyways, the moral of this story is wow, I didn’t know all of these lights could be so bright. The ECU display now reads very steady and the correct voltage – 14.4v right after starting and 13.6-13.8v idling when warm. The dashboard is almost comically bright and I had to turn it down with the dimmer for once. Cranking is much faster and less arduous. I should probably go inspect the status of the ground lug on Mikuvan at some point.

By the way, after resolving this issue, I completely reset the FiTech ECU and had it ‘relearn’ the fuel maps by driving around a bunch in mixed regimes. The stable and higher voltage power supply probably helps with a lot of things, so I gave it a chance to re-adapt. Regardless of any other changes behind the scenes, it definitely idles more stably now, so I experimented with leaning out all of the air-fuel ratio targets so it wouldn’t chug gasoline as hard – maybe a few percent less.

Well, over a long distance, that sure matters, because I’m going to a CAR SHOW!!!

the Jalopnik Car Show for Great Justice or Whatever

Delayed once due to being rained out and with the full force of Internet irony behind it, the Jalopnik car show was held the Sunday after Thanksgiving. This would be the first road trip that I myself will get to take in my own vantruck. It would also be the first car show that I actually signed up for. I’ve been to others, including smaller local ones. Everyone has to remember that I am not actually a “car guy”, just a “this one particular silly van” guy.

It was going to be 4 hours on a Sunday in Newark (uhh), which alone is too short of a stay for me to want to drive 55mph the whole way there and back. So I turned the weekend into a general New York City excursion.

With this thing.

If there is some poetry in having a big-block V8-having 9-miles-a-gallon-getting emissions-exempted 21-foot long 65-tons of American Pride occupying a Tesla supercharger spot, I missed it for the funny photo opportunity.

The two Tesla drivers who came in and out while I was hanging around uploading this photo for peoples’ amusement didn’t say anything. Not to me, not out loud. They didn’t dare defy the embodiment of all that is America.

And here I am poking out of a parking spot in Flushing! I’m backed all the way up to the green wall. Actually, it’s pushing the green wall back a good 3 or 4 inches. I felt the contact, and kept shoving a little. Sorry, wall. Sorry, whatever was behind the wall.

So before getting here, I actually drove it straight into lower Manhattan and the Financial District/Battery Park area to try to find…. a location where I could take a photo of it with the Statue of Liberty in the background.

‘murica

Sadly, that part of Manhattan is too busy and blocked off for any of that to happen. Through friends, I was told that I’d have better luck in Jersey City or parts of Brooklyn. I decided that was out of scope for the day and retreated to Flushing to gorge myself on noodle products by performing a rolling Denial of Service attack on the Brooklyn-Queens Expressway.

Bright and early the next day! They said to show up early. I assumed people were going to start lining up an hour before it starts, so I hustled out of Queens and got into Newark around 10:30. It turns out the organizers had barely even gotten there, so whew.

Well, at least now I have one clean and recent photo of Vantruck before everyone else showed up.

 

Hey! I brought Chibi-Mikuvan along for the ride, and it was extremely popular. I did some promotion of Power Racing Series, but only when asked.

Originally, I wanted to trailer Mikuvan down, but decided it was simply too much of a production for a 1 day event, and dealing with a now 40-foot long assemblage of vehicles in New York City was a little excessive. If Jalopnik chooses to do a weekend festival of shitboxes or something, I’d happily organize a carrier battle group rollout.

The closer we got to noon, the more interesting things became.

 

It’s 12:30 now, and we’re starting to have serious traffic problems. Got it – so that’s what “show up early” means!

 

A Mitsubishi Pajero appears! This thing with a Mikuvan bolted to it is the international 4×4 Delica Star Wagon. They share a powertrain and running gear, whereas the 2WD Delicas (Mikuvan included) share more parts with the 2WD pickup truck.

 

This Pajero was indeed the turbo-diesel version, and a recent Japanese import. jdm

 

itp: hipsters

By 1PM, they had to commandeer the neighboring parking lot for all the Chad-come-latelys.

i have money watch me spend it

Okay, okay… that’s harsh. I am sure the owner of this McLaren 720S is a swell fellow. I think what I found endearing about the Jalopnik Car Show overall is that the variety was so not car show, by design.

I’ve been to ones which were Camaro-Mustang-Corvette-Lambo-Stance-Stance-Revolution where every entry was meticulously detailed and shiny and hardly looks like they’re driven. I don’t believe in trailer queens personally – despite keeping my machinery in good running order and generally sound cosmetic shape, they’re not perfect because I use them daily.

In the same vein, I’ll repair and upgrade but never restore Bridgett or Taki-chan, because you create a machine too clean and shiny to be used. Someone else can do that. I don’t want to be hit with regret every time I drop a piece of stock, much like I prefer to be fearless with Mikuvan and occasionally push dumpsters a few feet when the hauling company can’t be buggered to place it back such that it doesn’t block the loading dock.

tl;dr don’t hand me a nice thing

Hey, another truck-like thing! This Ford Bronco is of the first body generation, prior to Vantruck’s year range.  It was one out of only 4 or 5 SUVs/jeep-shaped objects, counting the Mitsubishi Pajero.

And another pickup truck, what a relief to see.

Overall, Vantruck was the only van/conversion van of any type (not counting CMV, of course) and one of only three trucks present, and literally only van-truck of course. Counting CMV, I also had the only van, only cab-over van, and only electric van.

Hell, it was the ONLY electric ANYTHING. If I had one thing to be disappointed about this show, it was the lack of electricity. Surely someone thought about coming with a Model S or a Chevy Bolt or something? Nope.

AAAAAANGRY HEADLIGHTS

My other takeaway from this show besides my aforementioned desire to never own a nice thing is that even show cars aren’t all perfect. Again, my only experience with car shows prior to this is ones where everything has an aura of perfection and polishedness along with a nose-in-the-air presentation vibe. So I had a skewed perception of “car people gatherings” as a bunch of perfectionist snobs. I had never wanted to bring Mikuvan to a show since it’s full of my mechanical cockups and bodges.

I think overall going to a show like this was a good confidence booster. Hell, even the Monkees replica car (1st photo, behind Vantruck) had clearly patched and painted over spots where the bodywork had cracked or deteriorated, and a lot of the more nicely finished modified/tuner cars had stuff just hanging off them and random dents and paint chips. However, again, that to me is more honest than a perfect display piece and ‘matching numbers’.

malignant vantruck syndrome

About two weeks ago, I was making my usual patrol rounds using my pre-generated Craigslist searches…

Yes, I have a couple of those in places I often go. Vantrucks show up not that uncommonly – I’d say once or twice a month. But generally they’re either extremely beat up & have sat outside for 20 years, or pretty severely overprived for the condition they are in (e.g. literally over $9000).

This one popped up, though, and it was in a near perfect combo of condition according to the seller whom I talked to on the phone, initial price, and closeness.

So naturally, I had to go and check it out. Portsmouth is but 50 minutes away, or an hour and 15 minutes in Vantruck speeds.

 

 

DOUBLE VANTRUCKS! The cause of global warming is right in front of you, ladies and gentlemen.

This one is indeed in very respectable condition. The owner is a retired engineer who has had four of these things throughout recent history. How do I know this? He had a dedicated photo album, each photo laminated and in a pocket, of all of the repairs and modifications he’s done to all of them. I want to say “wow, this guy is like me but with real life pictures” but the magnitude of things is so different I can’t begin to use myself as the reference point. It was, though, very inspirational to see how excited he was about all the ones he’s owned and the customization work he’s done.

Anyways, the best crusty old vehicles are usually owned by dedicated retired owners. This one had a slew of mechanical work and replaced components in the past 25,000 miles that I won’t bother listing here. I did some sleuthing underneath to determine the state of the frame and other bodywork. The interior is immaculate and all of the coachwork is original.

So you might think that I went ahead and expanded my aircraft carrier fleet. Well, kind of….

The trip was actually a scouting mission for a robot buddy, Alex of Wedge Industries, a long time northeastern robot competitor. In fact, me versus him was the Franklin Institute finals in the 30lb class. So now this thing is in the robot family… and Motorama 2018 is going to be certified dank.

I was going to Double Vantruck to go meet him for pickup, but the heavy snowfall on that day caused me to rethink that plan and I instead headed out with someone else who had 4×4 and a not 70/30 weight distribution. Here, Alex stops over in the shop after getting a trailer to tow his own car back with. Have fun with your 9 miles a gallon all the back to Pennsylvania :p

I now leave you with this.

 

ORIGINAL CONTENT! The All-Around Robot Update: Roll Cake Rises Again; Dragon Con 2017 & Uberclocker

Whoa, what happened to this place? Everything’s so dusty and gross. Why is there a pile of circuit boards on the bench??

*trips over Chibikart on the ground and dies*

Hey, remember: whenever I disappear for an unexplained period of time, it’s always because I’m working on something hilarious. This time it’s extra hilarious, I promise! Obviously I’m always itching to keep everything updated here on my latest, but just like the first BattleBots build season, externalities which if broken would make other people look like assholes prevent me from saying anything at the moment. See, I don’t mind me alone looking like an asshole…

Anyways, backing up a little in life, I decided to redesign Roll Cake from the ground up following my hub drive experiments earlier. MomoCon came and went, but the Hobbyking orders kept stacking up, so I decided to roll it all in with Überclocker’s changes for Dragon Con!

roll cake

It all begins with a wheel.

Doing the drive test with the SimonK ESCs and the Multistar 460kv motors convinced me that the hub motor direct drive would work out, at least better than the previous BS I tried to do. I went shopping for high pole-count, low Kv drone motors since they’re pancakey. The plan was just to approximate wrapping an O-ring as close as I could to the motor. I ordered a few of these AX4006 motors for their combination of weight, low Kv, and high pole count.

Roll Cake is a bot which faces some packaging difficulties, since the middle of the bot has to be left pretty open for the flipper linkage. It would actually be easier in a 12 or 30lb design, since ‘noise floor’ of part sizes is much smaller compared to the bot size. If I scaled this design up to a 30lber right now, those would basically be 6″ hub motors, which is unnecessarily large.

There’s other architectures and shapes for the bot which might alleviate this, but for the time being I decided to try and keep the cheese wedge shape but  make it a little more…

…round. Remember that the flat sided shape was just an attempt at vomiting my vision of a bot that I’ve had for a while now, not making sure it works. When you ditch the need for 6WD, things get a little simpler! Even this is technically unoptimal packaging since there will be a lot of wasted space in the narrower parts of the cheese wedge. I’m basically just reskinning Roll Cake v1 and using all the same parts, since the goal is to get it driving and flipping things reliably, albeit not spectacularly, before deciding what aspect of the design to improve.

Once I had the parts placed reasonably, I started generating frame features to accommodate, such as wheel cutouts and future bearing blocks. The chassis will no longer split in the middle – that required so much extra effort to get everything to line up. Instead, I’ll be splitting the rounded caps next to the bearings off as its own print in the future.

The previous image showed the old linear slider trigger, but packaging necessitated switching to a swinging style. This means Roll Cake won’t fire when upside-down with the drum running in reverse – I’d still have to ‘self right’ so to speak. That’s fine, since I’m also ditching the double-sided linkage due to it taking up the entire center of the bot from swing space. At least keeping the flipper single-sided lets it still have structure in the middle!

The chassis is now taking shape pretty well, showing the swing trigger’s backing and “drilled” bearing cap holes and the like. I’m designing this to print ‘upside down’ on the flat top face.

After defining critical part anchor locations, I hollowed things out to accommodate the flipper linkage and irritatingly rectillinear things like batteries. Seriously, if there’s one thing this design is sorely lacking, it’s a battery worth having. I much prefer this to be 4S, but can only fit a 3S pack of adequate capacity for now.

As I model the body, I can give components final homes constrained by mounting holes and then adjust the cutouts and spacings to fit. So there was a fair amount of tuning going on at this point, including a change of wheel size to be smaller in order to shift the wheels more rearward (to give me battery space!)

After that, the fun part became linkage design. The goal is to get a linkage design which travels as far up as I can manage using the roughly 1″ throw of the cam ring, and generally has no linkage interacting at more than 45 degrees starting angle.

My insistence on a “pull” action on the main cam linkage means I have to transform the motion through a bell crank (the bottom and right side short line) to become an upward motion. Strictly speaking, I could potentially accept a push action from the cam linkage and that can directly interface with the flipper arm and move it upwards, but it would need to be designed much more heavy to stand the compressive force instead of tension (pulling) force.

 

This bell crank itself went through a few revisions in order to minimize the impact it has on the middle of the bot, the large bulkhead that runs across the two sides.

Here, I’m comparing designed linkage travel with actual part placement, seeing how much of the middle of the bot has to be cut out. The bell crank center distances and topology have also changed. The previous design intruded on the center of the bot with its full height, whereas this “T” design means only the short leg of the T pokes through the center bulkhead.

Then I decided to wrap the bulkhead around the bell crank instead of hollowing it out pre-emptively. It’s all going to be 3D printed in 50% density anyway, so no need to pre-emptively deny myself cross sectional area (which is very important to 3D printed parts)

After I was satisfied with the bell crank geometry, I made a crude flipper arm model to start out with.

The linkages will have to fold into themselves a fair amount, so I pre-emptively carved space for them before doing anything else.

The intermediate linkage is a bit of an awkward shape – here it is taking form. It has to adapt the narrow bell crank to the wide flipper linkage. I decided to do it here, and reinforce the middle of this linkage with a big flange, instead of trying to flare the end of the bell crank wider due to my desire to print it flat and have fully un-interrupted perimeters to maximize strength.

Here, see the aforementioned flange in the center of the intermediate linkage. I’ve now hollowed the flipper arm, which will be top-skinned with hardened spring steel.

The armor for this bot is quite simple – primarily Onyx in massive hollow-ish sections for the crumple zone effect, and blue-temper spring steel covering the important parts and providing access hatches.

I added a little feeder leg next to a region with unused material thickness. This will be a machined piece which is captured with nuts and flat-headed screws.

Finished and ready for printing!

I had to split the geometry first into the printable sections. I extracted the bearing cap by making a 5-sided surface box in Inventor and using a split body by surface function. Only one was needed – the other was disposed of. Other sections such as the mostly empty tail were cut off also in order to reach the print volume, and they were designed to be bolted back on.

A day later… Her’s the frame finished, printed in 3-perimeter 50% density Onyx. Ought to be plenty!  You can see where I cut the end of the wedge off and have modeled in a few tappable holes to hold them on.

Here’s a pretend-o-bot to make sure the dimensions all fit. The bearing cap was something I was particularly nervous about. I didn’t design clearances into the linkage parts to save design effort (read: I’m too lazy to make proper constraints) so some filing was needed to get them sliding freely.

Hardware installation time! I made sure to make little access ports for the motor wires, because wouldn’t that be embarrassing?

We move now to my old high school workbench down in Atlanta, which is somehow still there and in operation (maybe being 16 feet long has something to do with it). I got all the mechanical hardware installed before leaving, and decided to save the wiring for the Dirty South.

Pictured in the foreground is my new best friend: the itty-bitty-baby-offset-screwdriver-bit-ratchet. It’s McMaster part number 52725A31, and it’s positively adorable AND the only way some screws on Roll Cake are accessible at all. I designed it this way, so it’s legit, right!?

 

As usual with this thing, wiring is a disaster. The ESCs of choice are the Afro 30 Race with SimonK set up to do reversing with my usual tricks. They’re small, but not THAT small. I decided to keep the ESCs on the same side of the bot as their motors in order to reduce the amount of long wiring runs, so there’s two on the right side of the bot and one on the left.

All the motor connections have now been made, and I left one task for last before I soldered the 3-pin signal wires to the receiver….

I had to program the SimonK firmware to activate reversing and braking and my preferred goodies. I planned ahead and made this servo to tiny-clippy-jiggle breakout cable which I’ve termed “The Simonator 2.0” in order to grip the signal wires of the ESCs. While I could have programmed them all beforehand when the servo conectors were all still there, I decided I needed this cable regardless just in case I had to change something in the field, post-installation.

I brought the finished bot to one of the robot panels at Dragon Con. Sadly this year I fell off the bus and did not host any panels, but I’ll make sure that changes next time! I’m glad that recently, my Makers presentation hasn’t really been needed – in the most recent years I delivered it, the percentage of the audience who’ve experienced CAD or soldering LEDs together, etc. has grown immensely, in my opinion greater than the rate of self-selection for these things.

Here’s the linkage fully opened! Note the preponderence of little shoulder screws forming the joint pins – I standardized all of these to the same length to save myself from my historic habit of making my robots all shoulder screw nightmares.

….and now announcing my new 6lb multibot entry??? This is the head of Lucy‘s Mei cosplay, the freeze-ray dispensing Snowball. overwatch has ruined my life run away now

I’ll post some of the test videos of Roll Cake soon – I was happy enough with its performance in the garage in terms of drivability and flipping, even if it won’t prove that impressive in the box due to being repackaged test rig parts.

überclocker

We now move onto good ol’ Clocker, which has looked like this since Motorama…

Pretty depressing, eh? In the final rumble of the 30lbers, I burned out one of the SK3 4240 drive motors, so I was on the hunt for replacements, and Hobbyking didn’t have stock in that size at the time.

What they did have is a sale on their new NTM line, which had a similar size motor:

So I scored a couple of these – they were physically the same dimension, but unfortunately these motors were slightly faster again, so I was facing the very real prospect of Clocker hitting 25mph without much provocation, which could be a liability on the Dragon Con stage.

I emptied the bag of Clocker remnants to see what I could salvage and what I’d have to remachine – the answer was really basically everything minus the motor output gear :p

Good thing Clocker is legal in the new 30lb Sportsman’s Class rules enacted FRESH AND NEW this year for the Franklin Institute event in 3 weeks!

To extricate the motors, I had to disassemble the frame, which proved a little…. challenging after Glasgow Kiss gave it a once-over. There were some special extraction techniques I had to use here on this machined corner!

From the spare Clocker parts bin I extracted another section of the 1/2″-10 leadscrew and flanged bronze nut that fit it. I’d bought a few spares last year in anticipation of needing to machine them eventually, and here we are.

The bronze nut gets machined all the way down to be smashed into the bore of the modified Vex Pro spur gear. When the gear spins, the leadscrew gets sucked in and out of the nut, and its own reaction forces are taken up by the bronze bushings surrounding it. All solid, all friction, all the time, but it gets the job done.

I’d like to eventually rebuild Overhaul’s actuator in this way, except with preloaded tapered roller bearings, for #season3 whenever it ends up being :'(

 

Mate this up with new waterjetted plates that I drilled and tapped and we have a new actuator. The drill gearbox was reassembled from stock pieces from my giant decade-old (…) bag of Chinese cordless drill parts, using the original shaft which was not damaged in the fight. I have enough pieces now to straight up make two whole actuators, which is nice.

After that, I repaired the bottom plate of the bot by stitching new holes in between the hole ones. I’m not sure if I’d use #4 screws like this anywhere in a loadbearing path (which the top and bottom plates do count as) if I redesigned Clocker again, since the indirect shock loads from the 30lb Featherweight class alone (in the form of getting socked by a spinning weapon) is much higher than Sportsmans. One of the corner hits from Glasgow Kiss sheared off a half dozen of my bottom plate screws just by momentarily bowing out the frame enough.

 

While I was in there, I swapped in the spare wheels made from 60A Mystery McMaster Urethane (actually OEM’d by Forsch Polymer, the most 1997 company extant in 2017). The white Smooth-on Simpact wheels had worked well enough, so I wanted to see how these would do.

Well, everything is technically ready for reassembly!

I rememberd a much better way of taking the entire top off Clocker. Previously, it involved trying to drive the center lift shaft out through ALL of the components that were shaft collar’d onto it. This was patently painful. Unlike Overhaul’s unboltable lift towers, Clocker has solid ones built into the frame rails. It turns out if I just unbolt the outer and inner frame rail on one side as a unit (9 screws), there’s enough room to wiggle the shaft out of the bearings and pop the whole thing off.

 

Clocker was the last thing I wanted to put the Brushless Rage test units in before shipping them off for production. The severely under-geared high-Kv motors will be a good stress test for the architecture, since on the Dragon Con stage I’ll mostly be driving at low speeds and turning/reversing often.

Check out that little Onyx bracket I made to hold the units. I wanted to place them flat against the frame rail behind them here, but this arrangement kept the wiring cleaner and away from the outrunner motors.

A new waterjet-cut gear and some quality Taki-time later, and everything is now back together. I did some drive testing outside, which showed me that the Brushless Rages were working great even under duress – the gearing on the motors is low enough that the bot has trouble turning in place on a high traction floor. So here I was hoping that it would be even able to turn at all on the Dragon Con stage carpet! But once it takes off… boy does it want to keep going.

the charles and the dragon con

Welcome to Dragon Con! Have a van.

I would have loved to bring VANTRUCK instead this year, as it has been now impeccably reliable after its lobotomy and subsequent headcrab installation, but could not even begin to justify the 9 miles per gallon each way. It’s beginning to dawn on me that the kind of person who would have bought one of these things new, never ever thought about the cost of fueling and ownership. I’m not quite to that level in life yet.

Overall, this con worked out a lot differently than some of my past Dragon Cons. See, I wasn’t scrambling to finish a robot every day for once – Roll Cake’s finishing work and testing occurred before the con started. Instead of trucking around a giant transforming mechanical prop, Cynthia instead prepared a bunch of pieces for the Dragon Con art show (which as I found out was nontrivial to get into)

On top of that, it’s become more of a yearly reunion for some of the BattleBots competitors and friends who have moved around the country & world. For example, I found Lisa Winter!

The cotton candy committee has arrived.

I attempted to replicate her tattoos in the middle of talking at a panel. Nailed it!?!

And for the first time in probably over 10 years, I actually played in a gaming tournament. There was an Overwatch ruined my life run away now tournament being hosted at the convention gaming center, and a few of us essentially set up #BattleBotsPlaysOverwatch.

The house equipment was sub-par, though, so we didnt’ do too well – people who have clearly been to more than one tournament brought their own mice, keyboards, headsets, and pillows and stuff. Now that’s pro.

 

HELLO FOR I AM MECHANICALLY THEMED VIDEO GAME GANDER AT MY CURATED ARRANGEMENT OF MECHANICALLY THEMED ITEMS

Alright, you know how Dragon Con goes down. Let me spare you the details and get to some robots!

MicroBattles has grown to the point where it has to be single eliminations only and running across two arenas to keep up. I’m glad that it’s a good problem to have! However, it does mean you’re pretty much one-and-done.

There wasn’t much to do with Roll Cake beforehand except get some driving in. I decided to move the tail on the flipper downwards one mounting bolt such that it was more likely to rest on the floor – otherwise, the bot tipped abouts its wheels a little. However, it kept weight on the feeder wedge, so that was a plus.

Robot Battles features mostly local builders who kind of keep to that series of events around the Southeast. It’s refreshing to see bots which haven’t been forced to become the small monolithic dense bricks that most competitions have forced them into being. These two, for instance, are hand-bent sheet metal from Home Depot, with a hand-soldered custom motor driver inside. I honestly miss these kinds of builds.

Pool noodle wheels were fully in fashion this year, made popular by the Dale robot Noodles. Hey, they’re totally not entanglement devices. The wheels aren’t supposed to come off, just incidentally if you hit them with your spinning thing! Wink wink. I suspect this kind of thing might get roundabout-banned somehow, but on the other hand, it’s 2017 – get a reversible ESC on your weapon already!

Sheet metal everything, down to the weapon! Now this is robot fighting.

Other builders who had too much time on their hands chose to adorn their robots in….. creative ways. That’s hand trimmed and applied fake wood veneer vinyl on Margin of Safety here…

I was pretty eager to fight Noodles since it’s high ground clearance and invertibility would have made for a whole match of flips with Roll Cake.

Besides the wacky builds, you had your usual array of kit-bots and modified kit-bots.

Roll Cake was matched with Margin of Safety first, obviously a fight that I was hard pressed to win. Aaron put on the miniature vertical drum module for the match, so we went head to head trading blows. Margins having the the smaller drum advantage,  Roll Cake got flipped over and I spent a while trying to self-right, but at the time didn’t have any skids on top of the bot, so I trundled it around a few times trying to get him to flip me back over.

See the two little hex nuts sticking up from the top? That was added after this match so I could get flipped over in the rumble and maybe get back up. With the drum bouncing off the ground, it wasn’t going to get enough momentum to roll it self back over, so after a while of trying, I decided to save the effort for the rumble.

In said rumble, the drum promptly threw the rubber o-ring belt and jammed as soon as it started. Well bugger me with a #1/2-20 tap, that sure didn’t come up in testing! So I spent the whole time running around like an idiot.

I suspect that spinning up quickly made the belt stretch enough (since rubber cord doesn’t have a tension element in the middle like fibers) to jump out out of the pulley enough to get grabbed by the drum. In Roll Cake 1, the pulley spacing was far enough apart that it would have just fallen off, but this time I had to move the drum closer and so there is a lot of overlap with the drum iself.

Hey, all things considered, I walked out with a working bot. It’s now time to get serious with Roll Cake. I’m extremely confident in the mechanism now, and so it’s time for it to stop being a test jig on wheels. The weapon motor is severely undersized – if there was one design which should have a motor-in-drum setup, it’s this one! And, furthermore, freeing up the space occupied by the weapon motor might mean I could use more conventional drive motors. The hub drive worked well enough, but I still prefer the positive feel of a geared motor.

And now it’s Monday!

 

With the return of all the robotty TV shows, we’ve seen a serious and sustained rise in the audience count. The room filled up to this level well before matches began, and the line continued out the door the entire day.

An entry being finished in the pit area before matches begin! How quaint.

Lisa brought itty-bitty Tento, weighing about 8 pounds, and entered it in the 12lb class for fun. This thing was built as a “how to build a robot” demo piece. Unfortunately, it suffered a gearbox failure literally right before matches began and it was of a type that nobody else was using, so spares couldn’t be located. Sad day – maybe next time!

Clocker just needed battery charging (and the replacement of a chain tensioner block) this whole event, so I’m quite pleased.

I only ended up having two matches – one against this giant purple thing (which had radio problems at the end – notice us both running onstage to disarm it), and the second against Dale’s Pushy Grabber. This thing has been sweeping RB events (literally) with the lynchpin strategy of wiggling under your bot almost no matter what. Now, normally I offer at least some resistance to Dale, but this thing I had to approach either at a very specific angle or risk getting plowed off the stage almost instantaneously. We had 4 total matchups, in the middle of which Dale had to reattach one of the rollers and I had to replace a chain tensioner block which finally decided to wear through and fall off.

This event really showed that, much like my arena-optimzed Test Bot v4 days in the Late Aughties, wide ground-hugging wedge surfaces really are more of a liability on the stage than an asset. Notice how in the final Pushy Grabber matchup, I tried executing the same strategy, but got hung up on the edge just long enough to become vulnetable. The only weakness of Pushy Grabber right now is a long-reach forked robot like Nyx with the lifter attachment – Clocker did not have enough “stickout” to really get a good handle on it – nor did it really on other bots.

Unlike version 2 and 3 where the clamp arm reached all the way to the end of the forks, this one for the sake of looking more like Overhaul has the ‘grab point’ more inwards, so I had a harder time getting opponents into the clamp in the first place unless I took a straight run at them with some velocity – upon which I would often run into the stage edges.

I stuck around for Rumble #1 which I won by virtue of trying to get around the damn stage and mostly ignoring opponents…. and in Rumble #2, I just took the wedges off and ran around like an idiot some more, accidentally handing the win to the purple thing after doing some kind of J-turn rocket jump off the stage. Oops.

This event was also the final straw for me in terms of gearing down the drive motors more. I’ve been threatening to go to 2-stage gearboxes for the drive, and now it’s more necessary than ever. Clocker v3 was geared for 19mph and was already a rocket, and there was barely any need for it on the stage. I’ll probably move to 11:1 2-stage P60s and use smaller 35mm drive motors.

Yes, this kind of thing is legal here, with a catch: It doesn’t exceed either 500 RPM, or 20 ft/s edge speed.  It’s driven by a geared motor, so it will more lift your bot up and chew at it.

 

Replicas of BattleBots entries are the in thing right now! This is Tuskin Raider, a 12lb Razorback-alike that Jamison built. It got all the way to the 12lb finals.

This is a 12lb shell spinner.

And here we have the assembled Power Rangers shot of all the scale models. Hey, we can film #season3 right now if we just get all the cameras up really close. I keep bugging Jamison about why he didn’t make Tuskin a 30lber instead of a 12lber.

So that’s it for Dragon Con! Two working robots remaining, shenigans abound, and…. no van adventures. Wow, when did my life become routine? Obviously it’s time for another all-vans update soon….