Cutting the Inside Hole in the Bottom Bracket Tube Bushings

Last night I cut out the "Inside Hole in the Bottom Bracket Tube Bushings"

The first pic shows what didn't work: using a ground off wood bit and lathing it out with my drill press and cross slide. Cut not bad, but no way to measure.

2nd pic shows the was that worked. Put an end mill in the drill and rotate the bushing stock on a bolt bolted to a clamped piece of wood.

One bushing is PREFECT, the other is a hair loose, I may redo it, cause it is fun to make!




One bushing installed, one on the bench.