Re: [CAD_CAM_EDM_DRO] Re: BALL SCREW INFO

What are the relative merits of the various types of ball/lead screws/threads?
So far I've seen mention of steel, brass, plastic, normal(?), zero backlash of
several sorts including plastic types, and I think, coarse vs. acme threading,
etc. Lots of mention of strength, accuracy, weight handling, and longevity,
and so forth, but having no practical experience of them, I and probably others
here are left wondering.....

Bill

On Thu Dec 6 18:55:34 2001, currinh@..., <currinh@...> wrote:

>Dany:
>
>There are several sources. I know of Rockford, Thompson, & Hiwin. You
>can also puschase through McMaster Carr or similar industrial supply.
>
>What type of milling machine? I this for manual operation or are you
>aiming at doing a CNC retrofit? For our class of machines, hobby, you
>probably want "precision rolled" screws with anti-backlash nuts. These
>aren't much more expensive than plain rolled but are somewhat more
>accurate. I think they are just selecting the better pieces from stock
>for this. Ground screws are conisderably more accurate but way more
>expensive. The ground screws, at least on my old worn mill, would be
>overkill and a waste of money.
>
>I looked around for an X/Y ball screw retrofit kit and finally purchased
>from Rockford. They supplied a kit for my Supermax mill rather than
>having to slightly modify a Bridgeport kit. Also, after looking around,
>I just ordered a screw and nut from them for my Z axis retrofit from
>them.
>
>Rockford's site is at:
>
> http://www.rockfordballscrew.com/
>
>It'll give you a good idea of what is avialable but no prices. They've
>been good to deal with and will give quotes over the phone.
>
>You asked for afordable ball screws. Afordable here is relative.
>
>Keep us informed as you progress.
>
>Hugh Currin
>Klamath Falls, OR
>
>On 6 Dec, Dany Tremblay wrote:
>> I'd like to modify my milling with ball screw to reduce the backlash.
>> Does someone know where I could find some afordable ball screws and
>> nuts?

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