Grafting feedscrew (Q from a new guy)

[PixMan]

(04-30-2015, 05:37 AM)EdK Wrote:

(04-29-2015, 10:54 PM)Dr Stan Wrote: Still does not sound right.  The spring pins could have been installed by an error at the factory.  IMHO I'd replace it with a very soft steel or even aluminum pin just to protect the more expensive parts of the lathe.

Not likely a factory error, more likely a design error.

How would one go about figuring out the correct diameter and material to use to replace the spring pins with shear pins?  

Ed

SWAG. Unless you have finite element analysis CAD software.

OK, there's probably some kind of chart in Machinery's Handbook, but I've never taken the time to look.