Straight RazEr in Atlanta

Sunday, August 28th, 2011 @ 2:56 | Project Build Reports, Straight RazEr

Straight RazEr is the first of the “travel fleet” to see action in Atlanta. It’s also the first to be broken and then on-the-spot modified.

First, the video. Straight RazEr was brought to Georgia Tech for testing and to meet with its nemesis Safety Razor.

The first thing to notice is that the front fork on SR is no longer layered, flakey deliciousness. I repeated the build cycle using identical conditions to when RazEr rEVolution’s front fork was constructed – namely, getting rid of breezes and incidental airflow in the build environment by placing a large trash bag over Make-a-Bot as it was building. The build turned out much better, with less warping and no layer splits. I wicked ultrathin CA glue into suspicious areas anyway, just to shore it up. Additionally, the geometry of the fork was changed so it was much thicker at the pin joint.  Like RREV, this front fork has not been problematic through high speed sidewalk running. I suspect a high seam or curb will still take it out, but it would probably also take me out.

An afternoon of test running caused me to become totally fed up with the low-hanging front. Every turn was a waiting game of sorts since any ground disturbance would cause scraping. So, being close to the Atlanta Hipster District Atlantic Station, I just went to Target and grabbed a standard Razor A scooter to perform a “neck swap” of sorts.

The base of operations was Georgia Tech’s Invention Studio, roughly equivalent to an upmarket version of MITERS that has departmental support (if you couldn’t tell by the two commercial 3D printers in the background… a third is to the right offscreen) since it is used for classes too.

I had anticipated that the A would be a direct swap with the A3.

It quickly dawned upon me that this was not the case. The A and A3 appears to have diverged design lines some time back, and the parts are no longer an exact swap. In particular,

  • The steering tube is a different diameter on the A. It’s slightly smaller (visible in the picture), but the fork still passes through. The headset bearings are a different size too.
  • The folding joint is just narrow enough on the A to not admit the A3 neck. Conversely, the A3 joint is just wide enough such that the A neck has substantial wiggle and the locking pin does not reach the detent positions.
  • And worst of all, the bolt pattern is slightly narrower on the A folding joint. The length of the rectangle is the same, the width was not. While I could have fiddled with the metal a little to get things to fit, this was more trouble than I found worthwhile.

RazEr rEVolution used an older version of the A which had the exact same geometry, so that swap was a trivial operation. However, the A and A2 line appears to have evolved further than the 125mm wheeled A3.

I will try to get an A2, which also has the modular front fork, to see if it shares geometry with the A or A3.

It somehow worked. You don’t really want to know how.

I ended up adjusting the shoulder screw on the end of the locking pin so it cleared the folding joint base (retaining the A3 base). Next, I just used the A headset bearing on the A3 fork and tube – this means the headset bearings are really not seated in the races, but more on the top edge. Whatever, it’s not a high speed joint anyway, right!?

Anyways, the result after all that is about another inch of ground clearance. Unfortunately by this time the sun had already set and the drive chain had already been broken apart, so Straight Razer will just have to wait for another day.

 

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