Re: [CAD_CAM_EDM_DRO] Re: Ball Screw Options

Mark,
I contacted the factory a few weeks ago, and they passed my inquiry
on to their local rep, here in Southern California.. It turned out that
their rep was someone I had done business with over 20 years ago. We
discussed using their material to cast new nuts around acme screws, and the
scenario went something like this:

1. Bore out the threads of the original nut, and create several grooves
lengthwise inside the bored I.D.
2. Machine two spacer washers to fit over the acme thread, with flanges to
fit inside the nut, to keep it centered.
3. Clean the screw thoughroughly, and find the least worn area of it. Coat
this area with multiple layers of a release agent allowing them to dry
between layers, until you build up adequate thickness.
4. Drill two holes into one side of the nut, and clamp the spacer washers in
place, with the assembly around the area of the release agent.
5. Pump the mixed up material into one of the holes until it fills the
cavity, and comes out of the other hole.
6. Allow this to cure for about 24 hours, clamp the screw ends, and break
the nut loose with a wrench. They sometimes work the nut back and forth with
the screw held in a lathe chuck, and even apply a particular type of lapping
compound, to loosen it up.

I haven't done this personally, but my friend tells me that the same method
is used to repair nuts in quite a few aircraft related applications. I hope
this gives you a better understanding of the process. I'm going to try it
myself, when I do a CNC retrofit on my Enco mill.

Marv Frankel
Los Angeles

----- Original Message -----
From: "natchamp_87" <mark@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, November 14, 2002 9:09 PM
Subject: [CAD_CAM_EDM_DRO] Re: Ball Screw Options


> Thanks Marv. The artical talks about ball nuts. Can it be used on
> my stock screw nuts or what? I had forgotten this was another
> option. It is like the molgice (?) stuff right? How does this stuff
> hold up compared to regular steel nuts?
> Mark
>
> --- In CAD_CAM_EDM_DRO@y..., Marv Frankel <dcdziner@p...> wrote:
> > I can give you a little insight on making your own very low
> backlash
> > nuts, as passed to me by Les Watts. Try
> > http://www.phillycast.com/products/inst-nut.pdf for further
> information.
> >
> > Marv Frankel
> > Los Angeles
> >
> > ----- Original Message -----
> > From: "natchamp_87" <mark@h...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > Sent: Thursday, November 14, 2002 8:38 PM
> > Subject: [CAD_CAM_EDM_DRO] Ball Screw Options
> >
> >
> > > Well, I've taken the plunge and purchased my mill for the CNC
> > > retrofit. I bought an older Bridgeport with an M head. It has a
> > > 9x32 work table and its perfect for me because I get the full 12"
> Y
> > > travel but the overall machine will fit in my garage much better
> than
> > > a full 9x42.
> > >
> > > Amoung other things, I'm trying to resolve is what I'm going to do
> > > for the ballscrews. I would really like input on what my options
> > > are. I've looked into the archives and am starting to get the
> angle
> > > of the dangle.
> > >
> > > 1) Is one option to install anti-backlash nuts on the existing
> stock
> > > screws? I've read about making/installing anti-backlass nuts but
> > > can't figure out if that applys only to ballscrews.
> > >
> > > 2) If I were to install new ballscrews and nuts what specs should
> I
> > > look for? Is 5 tpi the standard? How about the diameter?
> > >
> > > 3) If I do #2 above am I right in that I have 2 options, either
> buy a
> > > bolt in kit or buy the ballscrews and fabricate how the nuts
> attach
> > > to the table?
> > >
> > > 4) What do I have to do/consider for attaching the ends to my
> > > servo/stepper motors? Do I have to do any machining to them for
> this?
> > >
> > > I came across Nook Industries www.nookind.com. Has anyone used
> > > these? Are they the most cost effective ones? Is there such a
> thing
> > > as a cost effective bolt in? The only price I've seen is in
> McMaster
> > > Carr for @800 buckies. I sure wish I could do it for less. Any
> help
> > > greatly appreciated!
> > >
> > > Mark took the plunge
> > >
> > >
> > >
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>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>