Re: [CAD_CAM_EDM_DRO] Moglice

Thanks for the warning. According to Bruce the tech guy at Devitt
machinery rolled thread screws often have inconsistent major diameters
(ie uneven crests), and this can be a real problem for moglice nuts.
He suggested using teflon pipe tape as a release agent, so that is what
I will try for the first nut.

I'm going to do it at work where I can use the precision lab balance
to measure out about 25 grams in the proper mixture from the 10 gram
kit, which should be plenty to do a single 3/8" nut. I fully expect
to do it again at some point in the near future, maybe on new unworn
acme rod stock. I might even try to do the leadscrew, since it is not
slotted on the "9" South Bend model C-NC" (as I have taken to calling
it)

Chris

> Chris: I have done this. I also made a critical mistake. I used a mold
> release spray that I already had on hand. The problem was not in
> releasing but that the clearance was too tight after it released. I
> spent days trying to break in the moglice nut. The problem got worse
> when I oiled it. The oil took up what clearance was there and made it
> even tighter. I even tried breaking in the nut with a motor. Back and
> forth, all that happened was lots of squeeling and lots of heat. I
> eventually made a scraper that I could remove some of the moglice from
> the internal thread to loosen things to the point of making it usable.
> The nut was for the crossfeed on a South Bend Model A lathe. I only used
> the machine for a brief time because I got a Hardinge HLV-H and adapted
> the ballscrew setup for that machine and the SB has not been used since.
> The point being, I probably should have used the release agent that is
> recommended for use with Moglice. At least I wound up with zero
> backlash. Of course hindsight tells me that I would have been better off
> making another nut rather than trying to free up the tight one.
> Well, that is my story. I hope that it helps. Carey
>
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