Grafting feedscrew (Q from a new guy)

[Dr Stan]

(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

I'd just go with an aluminum 6061 pin turned from .25" stock.  If you want to get "real fancy" make a taper pin and ream the hole with a taper pin reamer.  McMaster (and probably others) has low strength aluminum dowel pins.  http://www.mcmaster.com/#standard-dowel-pins/=wz7hs5