I left you with the tube block, now I’ll post it in action.
That hole saw makes a pretty good cut, as long as you feed it slow. That’s .058″ which is thicker than a frame tube. It’s what I make seat tube sleeves from. Thinner frame tubes require slower feed rate, but they’ll cut just fine.
It makes a clean cut on the first shot,and that makes a nice tight miter.
Mitering main tubes is one thing, but chainstays is another. That’s where this next fixture comes in. I started this one with the milling setup I showed you a few posts ago.
I drilled a hole between the two pieces with my handy dandy new drill press, now I can bolt the pieces together to hold my Anvil dummy axle.
There it is, with a pair of stays in it. The big round thing slides in the slot, and centers the front ends of the stays. It also gives me a clue how much tire clearance I’m gonna have. In the next few days I’m going to setup a clamp to hold the front of the stays. Then I’ll be able to miter chainstays on it, too.