Re: [CAD_CAM_EDM_DRO] "Homemade moglice", ideas?!

Suggest that you consider painting the screw with a coat of enamel
before casting the nut. Coat the outside of the painted screw with the
mold release and after removing the cast nut clean off the paint. This
should give enought clearance for the nut to operate.

gary

Mike Pogue wrote:

> I cast some bearings around some socket head shoulder screws this way...
> They seemed to work OK, although it was a bit messy. The bearings ended
> up being quite tight.
>
> I used West Systems Epoxy (105/205) with 423 graphite powder,
> and a MS122AD PTFE release agent. I tried several ratios
> of graphite, and they all seemed to work pretty much the same.
>
> I thought about also casting a zero backlash feednut, but I figured
> that the natural small tolerances in the threads (I'm not using
> a precision leadscrew) would result in too much binding.
>
> HTH,
> Mike
>
> Jon Elson wrote:
> > efraimbarkbit wrote:
> >
> >>What about making a batch out of: quality epoxy resin, graphite powder
> >>and atomized (at least very fine!)PTFE? Any ideas on proportions etc.?
> >>I can get all of the above within reasonable financial limits, and
> >>could do a trial run of let's say 10 batches for making zerobacklash
> >>feednuts. It should be possible to make something similar to
> >>Mogliceputty (or injectable Moglice)
> >
> > Graphite can be quite abrasive, depends on how it is made.
> > Moglice has Molybdenum diSulfide, not graphite, as the
> > lubricating element.
> >
> > Jon
> >
>
>

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