Re: [CAD_CAM_EDM_DRO] Re: Ball Screw Options

Reidtool.com has a decent selection of Nook and Thomson ballscrew for a fair price,though Mcmaster has a larger selection of course.
And Ebay usually has a guy on there selling complete X and Y assemblies for Bridgeports for aroung $800.00
Ballscrews for a machine of that size is not really going to be cheap to begin with.
You get what you pay for. If you want accuracy and repeatability, youre going to have to pay the price.
You can make preloaded nuts for your existing leadscrews, but they will not hold tolerance very long, and you will be adjusting them quite often, and soon be replacing them if used daily. But with ballscrews, if you get a preloaded set or make your own preloads by buying 2 cheaper ballnuts and preloading them, the only lead error you have to worry about will be the lead error on the threads of the screw(usually around 0.0005"/ft and varies with manufacturer).
Youll probably get another mill before they fail on you, provided you keep them properly lubricated and clean of debris.
If money is your concern then you are definately in the wrong arena...........very very expensive little hobby we have!
Regards,
Jim
natchamp_87 <mark@...> wrote: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 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"
> To:
> 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
> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
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> >
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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
> >
> >
> >
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> >


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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



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