Re: [CAD_CAM_EDM_DRO] No more backlash!

Ron
I was thinking about getting the Grizzly mill. Did you make it a CNC
or manual?
Jim

----- Original Message -----
From: Ron Ginger <ginger@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@egroups.com>;
<sherline@...>
Sent: Monday, July 24, 2000 12:48 PM
Subject: [CAD_CAM_EDM_DRO] No more backlash!


> Several weeks ago there was a discussion about using Moglice to make
> nuts. I did some reading, found a Moglice sales rep and had him talk
to
> our New England Model Engineeirng Society. Everything I read or
heard
> sounded to good to be true. I also found a similar product from
> Philadelphia Resins.
>
> So, I got some of the resin, and made new nuts for my Sherline. It
> really works. I have no measureable backlash. The motion seems very
> smooth, and not noticably tighter than with the brass nuts. I think
this
> is the only answer for a Sherline size machine where ball screws
just
> cannot be fitted.
>
> This was fairly simple to do. I took the mill apart and cleaned the
> saddle block and leadscrews well. I removed the nut and
anti-backlash
> nuts and coated them with the mold release. I reinstalled the nut,
but
> instead of puting it in the correct place I left it just short of
the
> set screw hole. I put the leadscrew in place, coated with release
spray.
> I mixed the resin and injected it with a plastic syringe into the
hole
> that normally has the set screw to lock the nut. When the resin
reached
> the end of the hole I pushed the anti-backlash nut into place.
>
> The main nut and the anti-backlash nut served to trap the lead screw
in
> its exact alignment. This leaves an area of resin about 1" long
between
> them.
>
> I let it cure overnight, then removed the screw- It was a bit tight
at
> first, but once the mold release cracked they just unscrewed. I ran
them
> back and forth with an electric drill a few times. If you run them
to
> fast and long they do get warm.
> I reassembled the mill and ran a few parts. There is no backlash!
>
> Obviously I cant say anything yet about how long this will last, but
if
> it is half as good as the literture claims it will outlast me by a
long
> time.
>
> Im going to do my Grizzley mini mill next.
>
> ron
>
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