It has taken a little bit of time to get everything ready on my jig (and it’s still not done) but I at least have a solution for the BB. Here’s a photo of the seat tube, BB and head tube.
The Bringheli Jig uses a 19mm bar for the Bottom Bracket pucks. I figured I could use the BB bearings from the old BMX bike as sacrificial BB shell holders since those cranks have a 19mm spindle. However, the bike that I bought for parts is a Spanish BB and the BikeFabSupply BB shell I bought for this build is a Mid BB so the bearing OD is too small. I made a quick run to the hardware store and found some sink flange parts that will hopefully hold up long enough to get this build done. We’ll see.
I still have to figure out the rear axle. This Jig was not made for BMX bikes and the axle mounting is not intended to go below the bottom bracket. What i’ll probably end up doing is getting the front triangle tacked together then do some measuring and set the jig up on an angle that allows me to mount the rear axle properly. I think that would require rotating the jig clockwise while keeping the frame still. I’ll mock up the math part in my CAD drawing and see.
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I’m painfully slow at this, but in my defense, my shed doesn’t have any heat and it was 10 degrees outside. I’m not made for that. But the whole front triangle is mitered (mitre-ed). Just need to put vent holes in the head tube and bottom bracket. Then it’s on to the rear end.
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I took a minute to work on something new. I had started this little front rack a while ago for a different bike. I finished the platform for the rack but never started the bike, so it sat around but I finally got a new bike started and have a reason to make a rack for it.
I’m setting up this bike with a Dynamo. This is the first time for me and I’m trying to make this look nice, but also be easy to work on. It’s going on a carbon bike for now. But I’d like to make it easy -ish to move over to another bike when the time comes. Who knows though, I might like dynamos so much I build up another wheelset for the next bike.
Anyway, here’s some photos of the rack I built. It’s my first rack and I gotta say that holding and fixturing was the biggest challenge. Lots of baling wire, c clamps and random pieces of metal. I was having a really good time working in my shed so I didn’t really take many photos.
I haven’t seen a ton of information surrounding best practices for rack design, so I’m totally open to any suggestions on improvements for the next time or even modifying this one. I’ll post photos of the wheel installed later, can’t post photos of the bike yet because it’s under embargo till it’s public launch.
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