Archive for August, 2014

 

The Dragon Con 2014 All-Robots Update

Aug 26, 2014 in Bots, Events, Pop Quiz 2, Twelve O'Clocker, Überclocker ADVANCE

Every year, after duckling season, what is it time for? ROBOT SEASON! For the past 2 weeks, I’ve been making repairs and improvements to the (still yet to be settled, mind you…) 2014 fleet for Dragon Con, my annual end-of-summer robot party, as well as helping work on another thing.

This update will be quite short and to-the-point, seeing as how we’re setting out in about 8 hours or so. Robots at the top, panel information at the bottom! Normally, all of this would have come earlier with more interspersed information, but my shop obligations (namely restoring the place from a complete tornado disaster) take priority.

Überclocker

I’d mentioned near the end of Motorama that Clocker desperately needed a new wheel solution, and that I was looking at the Banebots hex-hub wheels to pull off a similar fast-changeable wheel solution like Candy Paint & Gold Teeth.

So I designed just that. A 0.75″ Delrin hex rod chunk functions as both the hub and the wheel bearing. Grooves cut into the hex mount retaining rings to keep everything in line axially.

Notice that those are “duallie” wheels. I decided to go for double wheels because these Banebots wheels are also not known for hard wearing and long lives, so I figured spreading the damage out could help. Clocker would probably burn through a set of singles very quickly, and while these hubs are meant for faster wheel changes, I still don’t want to do that every 2 matches.

The result is that the bot got wider by about an inch total. Not bad, but I still had to remake the axles.

I tried finding Delrin hex material, but it doesn’t seem nearly as common as other plastics in this shape and I’d have to buy 4+ feet from something that wasn’t McMaster-Carr. Well, I need it yesterday so I changed the material to Nylon instead, which is still more than sufficient, and I could buy it in much smaller quantities. Nylon is nice and all, but I still prefer the machining properties of Delrin.

And so the 100th build picture of Überclocker is in in a state of disrepair. I took the lids and most of the drivetrain parts off to inspect everything for damage or required rework. Overall, besides the bent front legs (and totally bald tires), everything is in good shape.

After trying to stretch a traditional circular retaining ring (“circlip”) onto the hex hub, I realized the points of the hex are just too wide to use that style – the legs just bent permanently since the deformation was basically up to the next shaft size. Well a trip to the hardware store netted some E-clips, which slide on from the side. Perfect!

Four duallie wheels made!

I ordered some 7075 aluminum round stock for the new axles and standoffs, since the length I needed was greater than the amount I had remaining from the last build. The four highly polished shafts (1200 grit wet sandpaper, using Tinylathe as the power source) are the wheel axles.

Everything being installed…

With this part finished up, I began restoring the legs. The only thing wrong with them was that the mounting points bent. They’re mounted each hinged on one 1/4-20 cap screw surrounded by a heavily preloaded standoff. Even though this extremely rigid, it still doesn’t like the whole bot bouncing off them. I had to replace the bent bolts and resurface the standoff to be square again.

Furthermore, one of the legs had a broken end roller with the remains of the shoulder screw embedded inside the aluminum leg. After cursing for a while trying to get the stub out, I decided to brute force machine it out and press in a large “insert nut” of sorts.

Removing the broken screw by milling straight down through it…

Making the insert nut, which has a press-fit outer diameter and 5/16-18 threaded ID.

The repaired thread in the leg. This is no longer as strong as the contiguous virgin metal, but it’ll work for now. I ran out of both stock and time to get new leg beams cut out.

Buttoning everything back up!

The ‘glory shot’ for this time around!

I’m highly satisfied with how the new BB wheels handle. What I wasn’t satisfied with was once again how closely I routed the chain to the wheels! I always seem to manage to design a chain drive with a critical but obvious failure owing to me trying to think of chains as precision components.

Nope. Chains are made of ass, and I need to design like ass to use them properly. Oh well.

In this test match between Clocker and Jamison’s somewhat new 30lber (which he’ll certainly update about, right brah?), the right side’s master link clip was torn off by some scrubbing wheel action. The left side’s master link had its retaining clip oriented inwards (away from the wheel). I resolved this by flipping the chain around so the master link clips were all on the inside. I’ve yet to lose another chain, so here is hoping to continued good luck.

Überclocker has no other changes besides the new wheels and the requisite screw tightenings.

Twelve O’Clocker

It’s well known that I have everything in multiple scales, so it’s time to pull out 12 O’clocker again. It did not compete at Motorama 2014 due in part to the lack of a Sportsman’s Class for the 12lbers, so DC2014 will actually be 12 O’Clocker’s second event.

It works fine. Hell, I could have thrown it right back in with no changes at all, but I did want to make a modification to the leg retaining system – specifically, making it actually function. The current leg retaining system is a big washer and standoff, which works fine for the upward direction that the leg is loaded in normaly, but if someone takes a good run at me, the leg gets pushed downwards and props the front of the bot off the ground.

Well, that kind of defeats the point. Here is the new design.

It’s just a clippy thing. That holds the leg from moving in either direction. Cool, huh!?

The profile shape is waterjet-cut, with a single drilled cross-hole. It’s still topologically equivalent to a standoff!

And here they are, installed!

That’s it for 12 O’clocker pictures. What, were you expecting more?

I did make some minor adjustments such as face-machining the leadscrew nut gear to reduce the amount of surface area subjected to sliding. This will hopefully make the arm less likely to “bolt” itself onto an opponent – the motor should always be able to free it up now. I also tightened up the chain drive so it doesn’t, well, Clocker itself.

12 O’Clocker will receive no further mods, since it really has been working the WHOLE TIME!

Pop Quiz 3!

Whoa! I still have this bot!

Last seeing action some time in 2011, it’s been hanging out in a bin I call the Mass Grave of Little Bots since it contains Pop Quiz, Pad Thai, and Colsonbot alike. As well as enough parts for another 2 or 3. I never repaired PQ after DC2011 since I had other bots to tend to, but little bots are always fun to dork around with, and with two working “big” entries (12 and 30lb, anyway… this isn’t 2002 any more where 340lb was “big”…), why not try to revive them?

Pop Quiz won’t be the only 1lb bot I try to revive – the entire Mass Grave is being brought down to Atlanta for some party time at the Georgia Tech Invention Studio. Whatever we all get running will enter, but I will not try too hard on the rest.

As for PQ itself, it’s going to get a complete from-the-ground rebuild, so it’s time to increment the number. I wanted to go directly to Pop Quiz 3.14, but I think I’m past naming bots after silly math jokes now.

Here is an overview of the new design:

Major deltas from the 2011 version: A much, much shorter blade. Titanium top and bottom. And a one-shot 3D printed frame that isn’t made of chunks of smaller prints.

Why the SHORTER blade? Are you crazy? Isn’t robot fighting always about who has the biggest pen0r spinning weapon?

Well, I mean, yes, but the longer the blade, the more likely the bot will just destabilize after a hit or, as Pop Quiz in 2011 did all the time, just hit itself and take off. That’s counterproductive to winning, or doing anything besides flailing around upside-down.

In the past, horizontal blade spinners have won, such as Hazard. Notice how relatively short its blade is – it’s principally a defensive wedge/pusherbot that just happens to have a pimp-slapping device on top of it, not a blade with wheels as so many spinners are designed today. PQ2 was designed this way, and the blade was easily 200% of the bot’s own width. Exacerbated by a lack of rigidity, it was a master of self-eating but not much else.

The blade this time is only 7.5″ across, a little thicker, and made of hardened steel instead of titanium.

I’m also moving it away from a battery disconnect switch to a Fingertech switch to reduce the vulnerability to slicing off its own power wires. Except there’s a problem: The Fingerswitch is too big for this bot. Everything is too big for this bot.

A few minutes of consultation with the designer, Kurt, and some other bot folks, led to this: the integrated Fingertech switch. I was just going to harvest the internals out of a stock switch and insert it into the 3D print file.

Besides this mod, the internals will remain basically the same. In fact, I’m almost straight up transplanting the working electronics from PQ2 into PQ3: Vex #29 controllers for the drive, 7.4v 500mAh lipo battery, and four little Sanyo-esque motors.

I added some small changes to the frame (such as the Integrated Fingertech Switch), but for the most part, this is the 2011 frame, except this time I’ll actually 3DP it in one piece instead of 4.

When I opened the old PQ up, I was greeted by ….. a giant lockwasher? This must have been underweight!

The Spektrum BR6000 seen to the very left (the front of the bot) will be changed out to a Hobbyking 6 channel receiver to match the rest of my objectively downmarket radio system.

The weapon motor. I haven’t been in here in a long time, either. This thing still ran well, and I made no changes to it.

Here’s the new frame, in black ABS plastic!

A few weeks ago, I ordered a bunch of small 500mAh 2S lithium batteries from Hobbyking of the same specification as the old ones. However, the general trend in lithium cells (as reflected in the auto industry, fast food industry, and smartphone industry) has been to get thicker/larger/bigger. I had to un-package the Hobbyking stock battery in order for it to fit in Pop Quiz’s 0.400″ thick frame!

The new top and bottom plate are no longer carbon fiber, but titanium. I caught a great deal on grade 5 Ti sheet on eBay.

I used the MIT Hobby Shop‘s new MicroJet to cut this piece out. It operates above water, so the light show was quite intense!

The steps to finishing Pop Quiz are basically stuffing the electronics and everything back in

So that’s pretty much the state of the bot as it stands now. Again, everything else will be either finished or not finished as we hang out with the GTIS folks, who are apparently also building their own entries this week. Old habits die hard…

Dragon Con 2014 Panels

As per usual in the past few years, I’ll be either hosting or co-hosting a few panels:

  1. Maker Resources: How to take advantage of the great abundance of resources on the Internet to build better things. Obtaining and using CAD programs. Digital fabrication services, 3D printing, waterjetting, electronics design, and so on. Focused on mechanical and electronic projects, and somewhat derived from my 2.00gokart lectures on resources.
  2. Rapid Prototyping Cosplay. With Jamison and Chris Lee, featuring a whole lot of others. How the rise of accessible digital fab processes has spurred the growth of aesthetic and functional costume parts, and how you can get involved.
  3. Electric Vehicles: with myself and Adam Bercu, a rundown on the state of the art in electric vehicle technology in both the commercial/automotive realm and the DIY/hobbyist realm.

More details on these will be released as they get closer. I’m going to try my darndest to get these recorded this year – I say that every year, but I really swear to Baby Robot Jesus this time, guys!!!

I’ll check back in after we’re in the ‘hood.

Silly Go-Kart Design: The 2014 Summer Season

Aug 16, 2014 in Electric Vehicle Design

Hello and welcome to another episode of Silly Go-Kart Design! I’m your host, Charles.

I knew that immediately after coming back from the Detroit race, I’d totally drop off the radar for two weeks as the MIT-SUTD Global Leadership Program drew to a close and everyone rushed to finish their creations. What does global leadership have to do with silly go-karts? Hell if I know, but they asked me to run it last year and it sure as hell worked out! I don’t try to read too deeply into things with “leadership” in their titles.

This year, the program was expanded to 36 students. Oh, dear.

Thirty were shipped from Singapore, while there were six MIT students who were accepted into the program after a local call for sign-ups.

Luckily, the crew for this summer was made up of some pros. First, long time compatriot in robot arms Jamison, then there was Banks (who was also an undergrad TA for the spring 2.00gokart session), and joining new this summer was Paige, who was actually a student in this year’s 2.00gokart and decided to help TA this summer session. Without highly experienced TAs, this summer would have been actually impossible.

Before I dive into the action, here are the deltas from the spring 2.00gokart. There’s some important changes that we made to scale the class to the biggest it’s ever been, now with multiple instructors. Much of the documentation was moved to The Cloud™ through Dropbox or Google Docs.

The Secret Ingredient

This past spring, I decided to spice up the design space by giving all teams the opportunity to use a troll free part: a pair of pink Harbor Freight wheels, which has since been decided was the best idea ever. As I mentioned in the spring 2.00gokart recap, I wanted to use Vex Omniwheels as the troll free part, because why the hell not. I’d checked out Vex omniwheels in person before and they seemed to be well-constructed enough to handle vehicle loads.

I’m proud to say that the troll design sweetener totally worked. Multiple teams went for the omniwheel solution, and none of it ended in little rollers being scattered across the parking lot.

Parts Buffering

In the three or so weeks preceding the program, I ordered a load of parts that, from past experience, students tended to gravitate towards the most.


My body is ready.

In past classes, everyone’s mostly gone for the classic Kelly Controller and Turnigy SK3-63xx combination, a wheel or two from Monster Scooter Parts, chain drives, pedal throttles and thumb throttles alike, the weird little black brake calipers, a Hella switch, and so on. Then there’s always the odd DC motor team, so I got stuff to cater to them too, with the most common DC motor used previously (the 24V “500W” size scooter motor). This cabinet was pretty empty by the end of the class.

I try not to ‘kit the class’, but with time so crunched during the summer session, this was one way of making sure people could finish time. Teams that ordered a part I just happen to have received their parts generally after a day or two’s delay so they could get working quickly, but not right away to preserve an element of fairness. My benchmark for fast shipping is McMaster and Amazon Prime, so most teams got most of their shipped parts in the same timeframe anyway. Surplus Center folks, however, were out of luck.

It’s important to note that the contents were not made known to the teams beforehand. By the end, everyone pretty much figured out what kind of throttles and stuff I had anyway, but the work towards the beginning was reasonably independent.

Bill of Materials

One of the cornerstone elements of my ‘class’ is that all teams order their own parts (beyond the small material pile I provide them). In all past terms and semesters, this was accomplished by one team member sending me, via e-mail, a list of stuff to order. This worked well enough, especially since I am the only person with a procurement credit card.

What this system didn’t have is a way for any other instructor to verify/advise on perhaps badly informed or thought out purchases. Nor could students see ahead of time what their teammates ordered – near the end, everyone starts sharing parts and excess materials. We wanted there to be a bit more networking available to them, as well as to have the ability for each instructor to oversee the activities of a handful of teams.

For this BOM, we set up a Google Doc spreadsheet that was editable by invited students. Each team designated one member to be the go-to for finances. Through this spreadsheet, they were able to not only specify parts to be ordered, but also have a real time check of their remaining budget.

Students had made their own BOM Excel spreadsheets in past classes, but this made everything uniform and accessible.

The ordering protocol was that every purchasing day (Monday and Thursday of the 3rd through 7th weeks) I’d sweep through the BOM and then highlight green any items that were ordered. I’d highlight in red any items that were NOT ordered – the reason usually being that the specification was incomplete or the item was out of stock. Students were warned repeatedly ahead of time in both Milestone documents and the “Resources and Parts” lecture that this was going to be enforced strictly. We had very little issue with this overall.

This is an example of a fully filled out team BOM from the end of the class:

As can be seen from the image, I indicated when the order was fulfilled – for “class stock” parts, I changed the line to green when I made the “delivery”.

This BOM system worked out great, and I highly recommend it for anyone else trying this. Around the middle of the summer, one team made a “Stuff to share” tab with a similar format and quite a few teams listed their excess screws and materials.

Waterjetting and 3D Print Queueing

In semesters past, I was also the concentration point for all teams’ waterjetting files. Since 2.00gokart and last year’s GLP program only hosted 10 teams, it was still reasonable to keep track of. With competent instructors and more teams this time, we chose Dropbox as the venue for team parts submissions. I set up an instructor’s Dropbox account using our instructor email list as the account holder. The students were asked to either form a new Dropbox account or purpose an existing one (such as a personal account) for the class, and we sent invites to the e-mail addresses they gave us.

This way, any one of us could see in real-time what they uploaded. This caught a handful of potential “waterjet derps” before they were accidentally manufactured. I also recommend using this method, or an equivalent service, to sync fabrication files with instructors.

Within each team folder, students were asked to create folders with the date of submission (e.g. “Waterjet 23 July”) so we could keep track of what was submitted when. I put example folders in each group, such as “Waterjet 1 January” – this backfired at least once when one team absentmindedly put all of their waterjet files into that folder instead of one with the submission date on it, so we didn’t find it for days! Confusing examples are to be avoided in the future, but I gotta wonder some times, you guys….

So these back-end improvements are basically what differentiates this summer session from past sessions. I’m pleased with how they turned out – overall, there was minimal instructor confusion.

the build season

Now it’s time for the war stories! By all measures, this was the smoothest show we’ve pulled off yet – there were only a handful of issues that I’ll address soon. We begin with the first day:

One perk of having multiple instructors is someone can always be taking pictures. So here’s a photo of me giving the introductory lecture. In this one, details were given about the class, schedules, TA/Instructor/shop hours, design rules, and so on. Videos were shown of past semesters. That was more or less the calmest this whole summer was going to get.

Right afterwards, all hell breaks loose:

The demo parts were busted out and people began getting a sense of dread for exactly what they’ve gotten themselves into.

…and test drives were handed out. Not of Chibi-Mikuvan, mind you – that’s how people die. I put it out for display as a slight contrast against most of the aluminum extrusion framed, outrunner-powered karts present as examples (including the Chibi Twins).

It’s interesting to note that the majority of Singaporeans do not drive or own a car. The Singaporean government has purposefully made it very expensive and time-consuming to own a private vehicle on the island, due to traffic congestion and land concerns, so instead they spent massive money on a very well developed transit network. Seriously, I can get clean across the whole country in an hour on the trains, and buses will take me to the nooks and crannies. That’s how Shane and I explored so many resources when we were in Singapore. What buses don’t do, taxis will. So really, most of these students have never touched a motor vehicle in their lives.

And boy, did it show. The test drives comprised a whole lot of “100% throttle, 100% brake, 100% throttle AND brake at the same time”.

I once calculated that it would have cost about $85,000 to put mikuvan on the road in Singapore, not that they’d even let it in the country in the first place for being such a disaster. In the U.S., it cost me about $950: $800 to buy the thing, $50 for a PA temporary plate, $75 for a MA registration, and $30 for a MA state inspection sticker – ignoring the transit costs of renting a truck and trailer, of course. In singapore, the “Certificate of Entitlement” saying you may even own a car in the first place would have been around $80,000 (converted to US).

These kids will never understand the joy that is being under your vehicle, covered in burnt motor oil grunge, while contorting to European gymnastics levels to reach an impossibly tightened nut which you quickly discover you used the wrong socket driver size for. Maybe this is for the better.

In the first and second weeks, students generate ideas for their designs and perform analysis of  their desired drivetrain/performance parameters to select the core components – generally system voltage, which motor, which controller, and what size wheels.

One major aspect that differed from last year was that most of these students (something like 66%) were not engineers, electrical or mechanical: they were Architecture or Design students. Many of them had never touched hardware or tools in their lives. I was not informed of this beforehand, else I would have tailored the curriculum with more introductory material. It became painfully apparently during Week 2 when the heavy drivetrain and motor math was introduced – the amount of blank stares and glazed-over looks I received was disconcerting. As a result, we had to hold more hands during “office hour” tutorial sessions. Eventually, most everyone got their heads together and understood why I was making them perform these analyses. Other “crash course” subjects that were a direct result of the students being majority not MechE (unlike last year!) were Solidworks and machine design/mechanical parts knowledge areas.

Pursuant to the lack of experience in this field, many of the karts were somewhat derivative technology-wise. Seen above are students measuring and appraising Paige’s 2.00Gokart project. Many measurements of Chibikart were also made. In the end, though, I’d say the majority of vehicles were not copy-and-paste: the students took the modular concepts of what worked from our examples and reused the modules in their own designs. For example, the Chibikart style of motor mount/corner structure was popular, but in a kart which otherwise had nothing to do with Chibikart. This is totally fine by my books.

Hey! That looks familiar!

Now we’re moving onto week 3-4. Prototyping and getting your full-size mockup together was key, here. I bought something like 300 pounds of 1/4′ and 1/8″ MDF from a local wood supplier , just like during spring 2.00gokart, to let the students prototype to their heart’s content.

Again, the difference between the ‘prototyping’ they’ve been taught and my style became apparent. During this period, some students were frustrated that they were lacking material to make the traditional “prototype” seem in college design and build courses: foamcore, cardboard, wooden dowels, and the like. A few were not sure where to start because of this.

We explained as best as possible that the idea was to go directly from detailed CAD to full-size mockup. And again, this would have been totally fine for a crew of Mechanical Engineers, but time was lacking to accommodate the desires of the Architects and Product Designers. After some frowny faces, people dealt, and the mockup frames sprouted quickly.

The MDF ran down low towards the end of the class (week 6 and on) because many teams used very generous amounts to create bodywork, custom seats, and the like; necessitating me reordering the MDF shipment. My apologies to everyone in the Cambridge-Somerville-Medford area who might have been trying to obtain 1/8″ and 1/4″ MDF materials in the past few weeks.

Hardcore fabrication begins around week 5 as peoples’ parts come in and they realize that “steel rods” don’t make “steel axles” necessarily, among other intriguing facets of mechanical engineering. Also, you don’t tap threads with Loctite as a cutting lubricant.

Above, Tinymill is seen with its groupies. We ran machine training sessions as-needed for team fabricators.

Here, a student is seen nesting in a pile of go-kart parts.

We began taking waterjet cutting submissions during week 4 (basically early July), and one Milestone requirement was to submit several different waterjet parts. Unfortunately, not having a grade or something of coercive force behind it, few teams adhered to the requirement. Submissions really began hardcore around Week 6, which resulted in plenty of waterjet spawncamping by all the instructors.

One aggravating factor was that we originally intended to split the duty between two machine shops which had waterjet machines, but one of them ended up having machine and water supply problems in the middle of the summer, causing us to have to ditch entirely to one shop. That shop was one where only I and Jamison had authority to run the machines, so we ended up having to babysit the waterjet for 2x longer than intended.

It’s important to have a reliable service supplier, and possibly even a backup supplier, if you run a class similar to this. We could not have foreseen the first shop’s issues (and frankly, neither did they), so if I did not negotiate the second shop’s permissions earlier, we’d been b0ned (that’s a technical term).

During the last weeks, the design students’ creativity really began showing through.

I actually like having this summer crew of mixed backgrounds and majors. Why? Because nobody really build a normal go-kart. Even though there were challenges, it’s refreshing to see some experimental, kind of out-there designs, instead of 4 wheels and a steering column. There were rear-steers, there were hand controls, there was an attempt at torque vectoring, and so on. The lineup looked like something out of Wacky Racers.

Nobody’s under grading pressure to “do it right”, so they do it how they want – once again, aligned with my goals for the class.

Just take a look at “Trollkart” here. This was one of the normal ones. They found out that they didn’t really have a good ergonomic location for the throttle pedal. Solution? Make it a hand throttle pedal.

Also, they used the 1 Harbor Freight pink wheel that I gave them for free as a seat cushion. As it turns out, the hub really does not project upward enough to… uhhh, cause damage. They assured me of this fact, which I later confirmed.

…and yes, we had an “Omnikart” team! It took them a ton of effort to squeeze four motors and controllers under the statutory $500 budget, but they did it . Sadly, they spent too much time getting the mechanics running and dropped from the running for the race – instead, spending the whole period during the race trying to get it to drive. Maybe this was a little too ambitious, but the team was super into it the whole time. It was simply too much work for relative novices in an 8-week build period.

I hope to see Omnikart slowly hovering around SUTD in the future.

As week 7 draws to a close, chaos breaks loose in the IDC. Lines for the cold saw are backed up out the door, and people are starting to work on vehicles wherever they can find space!

the contest

We set up the track the same way as last year and this past spring’s 2.00gokart. This procedure is now well established enough with the safety office and parking office that I think I can throw a full event with 2 weeks’ notice, which is pretty awesome. The students were all eager to finally test their vehicles – remember that for many, this was the first complete functional project they’ve worked on.

It was a hard decision for us, but at the end of the build weeks, we decided to scrap the Time/Energy contest we’ve run in years past. The reasoning was that so many teams were just out to drive around novel designs that it made little sense to try and meter their energy usage. So really it became a race of time-only, and a few teams were clearly out to just drive their creations regardless of lap time! I believe that learning is most effective when you’re not under duress, so in the spirit of the program I went along with the instructors’ opinion to scrap metering the energy usage of the teams. It removed a significant bottleneck in queueing karts up for the individual runs.

As I was busy running the event itself, these (awesome) photos are mostly courtesy of Banks and his übercamera.

A great motion anti-blur of one of the omniwheel teams. They were clearly just having fun spinning around everywhere with omniwheels in the back. I took this thing for a spin after the formal event was done, and it’s borderline impossible to control after you get up to speed!

This is what happens when you don’t listen to me about fastening your wheels on properly, guys. One of the teams had an unfortunate, chronic disease of shedding wheels.

Field repairs! I strictly enforced a no-bringing-your-own-tools rule this time, so teams had to make do with a “pit kit” we assembled of the most common hand and power tools. During 2.00gokart in the spring, there were some problems with teams sneaking tools out of the IDC because they needed a special size of long-reach ball-ended hex key to reach their wheel mounting screws or whatever. Well, this time, I had a whole lecture devoted to design-for-maintenance, so y’all have no excuses!

One of the ‘off the wall” karts: a rear-steer, tiller-controlled trike. This is basically a normal go-kart turned completely around. Their complex rear steering linkage ended up biting them, but otherwise it was highly entertaining to watch snake around the course’s cones.

One of the “normal” karts, from a team of self-proclaimed newbies. For being said newbies, they did quite well; ultimately, they shredded their two rear tires!

An issue crops up with Team Newbie Kart.

We called this one “Overconstrained-kart” because they had a single middle rear wheel with drive wheels on the sides. They insisted that the center wheel was needed to support the driver’s weight. Pretty much everyone insisted back that they’d get much better performance if they removed it, which did happen during the middle of the event.

It did perform better.

One way to be fiercely stylish is to match your custom go-kart’s seat.

Don’t worry, Omnikart did get up and running during the event, but they burnt out two of their motor controllers. If I had known that the “40A” robot controller they picked for their design were about as well-built and rated as most robot controllers on the market, I would have offered them a free pair of RageBridges.

After the individual team runs were done, we moved onto “Anarchy Hour” where everyone who wanted to run head-to-head could do so.

At this point, MITERS invaded with Chibi Atomic Jeep! Sadly, I couldn’t get Chibi-Mikuvan back up and running in time due to the necessity of running the whole show.

The Electric Vehicle Team also showed up with its motley crew of rideables. And… wait, is that LOLrioKart?! Why, yes it is – under the command of a new captain. LOLrioKart sat abandoned in MITERS for almost 3 years before it was revived this year. This is the first time it’s been on a track of any kind.

Yeah, it’s as precarious and top-heavy as I rememebered it. Even more so, with it lacking 150 pounds of nickel batteries at the very bottom!

The photo of entirety for this year. Check us out in the background acting all goofy!

the future of 2.00gokart

There were plenty of improvements on the class structure that will make future sessions that much more streamlined, including the use of Dropbox and Google Docs to coordinate instructor effort. I think the class procedures and content is very much at a plateau of stability such that the class can be redistributed easily to anyone who thinks they can run a version of it. Already, I’m seeing derivative and inspired seminars/classes pop up – from a group at UC Berkeley to the Artisan’s Asylum to individual makerspaces.

Unfortunately, I think I’m no longer in a position where I can run 2.00gokart (or the summer session) again. I’m first and foremost responsible for the daily operation of the IDC fabrication shop. It used to be that the IDC was very small and easily managed alongside teaching, but nowadays it’s grown to house dozens of researchers and students. I can no longer justify the time put off running the shop spent towards teaching the class. Each time the class runs, the shop falls into disrepair because I literally only have time to fix what’s broken just enough to keep the students working.

This summer saw my spare time stretched to nearly its limit, and at times, it was frustrating to try and keep up with researcher’s needs while answering go-kart questions. It sucks, since I want to see this happen consistently and would vountarily do so if relieved of the need to run the shop it’s housed in. I’ve let the higher-ups at SUTD know about this issue, and I’m making plans for the continuity of 2.00gokart for next spring and years to come, but for now, I see myself fully entering the role of facilitator and stepping aside on my teaching duties.

(read: IT’S YOUR DAMN PROBLEM NOW! MUAHAHAHAHAHA…)

As for the class itself, I’m once again making the materials I generated freely available online. There are two forms:

  • First, a ZIP file containing only my lecture notes, “milestone” weekly report documents, and other files which I have sole copyright over: MIT-SUTD EV Design 2014 Reference Files. Not only does this have the 8-week program for the GLP, but it also contains this past spring’s 2.00gokart class Milestones, which is a 12-week program with more discrete weekly goals. This past spring, 2.007 itself implemented a “physical homework” system, which is also included in the Milestones but are not tied to or required to use the course materials.
  • Second, I’ve made the MIT Stellar Course Management System page for this summer session publicly accessible (Global Leadership Program 2014). I’ll investigate maybe having this ported to OpenCourseWare for more permanence, but for now, Stellar is stable enough.

That pretty much wraps it up for this year. The smoothest and most enjoyable season of “silly go-kart design” might very well be its last, but we’ll have to see what the future holds there. The students have once again packed up their vehicles and parts for the trip home, so at the very least, we have sprinkled Singapore with even more seeds of mischeviousness!

As for myself, it’s going to be a week of cleaning up the tornado disaster that is the shop, as well as shifting my focus onto ROBOT SEASON! BECAUSE DRAGON*CON IS SOMEHOW 2 WEEKS AWAY! Stay tuned for updates on that front.