07-29-2015, 10:33 AM
One of the littlest gears in the gearbox. Mine's broken too, never found a need for it anyway. Aren't they keyed together on one of those oddball aluminum bushings, the ones with external keys/ears built in? If it's the one I'm thinking of (.0018" feed), there's no serious load on that gear. It's so small there's very meat little to it; any pins will be stronger than those teeth that look a tad undercut already.
Btw, you can drill holes for pins with a tuned up drill bit. Tune it by rounding the cutting tips just like you'd do with a HSS lathe tool bit for the same reason - it improves the surface finish. Drill your hole with the next smaller drill, and then follow it with the tuned up drill. Nice finish and on size, but don't forget the loctite...!
Btw, you can drill holes for pins with a tuned up drill bit. Tune it by rounding the cutting tips just like you'd do with a HSS lathe tool bit for the same reason - it improves the surface finish. Drill your hole with the next smaller drill, and then follow it with the tuned up drill. Nice finish and on size, but don't forget the loctite...!