Re: [CAD_CAM_EDM_DRO] Re:Casting clearance

Ron Ginger wrote:

> I was as generous as I could be, with a $25 spray can :-)

<G>

> How long did you make the nuts?

For the Max nuts, they were about 1.5" long. To lap these, I turned a
length of acme stock at one end to fit one of the tap collets in my
Procunier tapping head, and set the head up in my lathe. Lots of back
and forth. At first, when things are really tight, the nut will get
quite hot, so I'd lap one until I felt it was getting too warm, then
switch to another. To check actual running fit, I had to wash each nut
out but good, lube, then check it on the actual screw it was going to
run on.

For the surface grinder nut, I think it was almost 2" long.
When I got to the lapping stage for this nut, I just held the turned end
of the screw in a collet and manually reversed the spindle at each end.
A foot brake helped a lot there.

I got the Timesavers from Devitt Machinery, same place I got the
Moglice. Mixed it up with light way oil. Stuff settles out quickly,
needs to be stirred fairly often. Timesavers is supposed to break down
totally and stop cutting. I found it difficult to tell when it had
broken down, so was pretty generous with it.

This is a messy and time consuming task. If I cast another nut, I'm
going to really lay on the release agent!

Jon