I should probably do it again, because I can get the fit a bit closer. I should learn how to use one of those inside hole sensing devices to get the exact size, because I don’t think I got a good measurement from my calipers. There’s a slight bit of wobble, but it is better than we were (without one). I’ll probably remake this at some point, but now we have something that works.
@Stevemopolis took a quick look at the work last night; it looks like my measurement issue could actually be based on the geometry of the hole; we think it might be a taper!
So this time I did a much better job of creeping up on the dimension. I also figured out how to unmount the quill on the tailstock so I was able to do test-fits on the metal lathe. There’s no perceptible movement and it is a bit of a tight fit. From what I can tell, the clearance is about 0.05mm, but that’s far below my measurement error I imagine.
I also made it with some chrome round bar I found in the back bins. That stuff was super tough and I had to take lots and lots of very light cuts. I imagine that’s probably a job for carbide tooling, but I got the job done.
I’m happy to have that little lathe back in full action. If you use it, please let me know how it works out.