Grafting feedscrew (Q from a new guy)

[EdK]

(04-28-2015, 11:30 AM)TomG Wrote: I'm a little late to the party, but it still seems like a good time to throw a monkey wrench into the whole shebang.

Most lead screws have a joint with a slip fit that are then pinned with a soft pin that will shear if some idiot runs the carriage into the headstock. If that happens, the pin will shear off rather than teeth on a drive gear. All of the aforementioned techniques will make a secure joint, but if you want some insurance, I would suggest pinning it instead.

Tom

I wish my lathe had a shear pin. I've often thought of trying to add one but I'm not sure the lead screw in its current configuration can accommodate one.  

Ed