Re: [CAD_CAM_EDM_DRO] Re:Casting clearance

Ron Ginger wrote:

> I did the Sherline nuts and they worked OK, the larger ones for
> the Grizzley failed.

I did some 1/4-16 acme nuts for my Max, and a 1"-10 acme for a surface
grinder I was restoring. The smaller nuts were tight, but could be
removed and I was able to lap them without great difficulty.
The larger nut, I thought for sure I'd have to scrap the nut by
machining it off. Luckily I had an extra inch of screw, and used a pipe
wrench to get it backed out. Turned off the now munged threads, and
cut a tap-like relief in the end of the screw. I gently upset the edges
of one full thread form to increase the profile, and ran this through
the nut a couple times to scrap out some clearance for the oil and
Timesavers lapping compound I used to finish fit the nut.

I'd applied what I thought was way too much release agent on the large
screw, and it still wasn't enough. If you have any sense of caution at
all, I sort of doubt you will have to worry about applying too much.
Be generous.

Jon