Re: [CAD_CAM_EDM_DRO] Re: Max feedrate of ball screws?

Jan,
I wasn't familiar with the Turcite material you mentioned, so I
checked the net. It appears that it comes in solid form, and has to be
machined and threaded. A while back. I was pointed to www.phillycast.com web
site, to a product they make called Super Alloy, which is castable, and
probably an easier way to form threads onto a lead-screw. You can get more
info on this material from Les Watts, one of the very knowledgeable members
of this group.

Marv Frankel
Los Angeles

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 05, 2002 8:43 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Max feedrate of ball screws?


> In a message dated 12/5/2002 5:20:14 AM Central Standard Time,
scsm@...
> writes:
>
>
> > Other than a rotating nut, (which I may end up going with) what other
> > method is there to acheive high travel speeds (300+ IPM) I really like
the
> > idea of a rotating nut, but unless someone has already built one and is
> > willing to release the design...
> > It looks like it will be a complex engineering progect, and rather
> > expensive to machine...
> >
>
> Seth and others:
>
> Decades back, in a galaxay far, far away, I had to do some engineering on
a
> large X-Y table with LONG lead-screws. For the 10'+ "X axis", I used a
pair
> of 1.5" dia. ball-screws with a 0.5" lead. (Yes, cost some $$$!!!). The
BSA
> catalog has some reasonably-clear engineering-suggestions how to overcome
the
> "whipping" a long lead-screw does when rotating, and that, already, is
> "involved". The idea of a rotating nut is NOT a bad idea, as that way,
the
> screw can be rigidly fastened at both ends, and the screw's RPM will not
be a
> hassle.
>
> Complex engineering project? Expensive to machine? What do you expect, a
> "free lunch" (paid for by HEW) ? ? ?
>
> If precision is not a factor, you might consider sprocket-chain or even
> "timing belt" and toothed sheaves, etc. UGH! Makes me thing of
earth-moving
> machinery, not "precision gear"!
>
> But yes, I agree! BSA should be reading this thread and publish drawings
in
> their catalog which SHOW how one might rotate the dual, preloaded nut,
rather
> than the screw. Hmmm . . .
>
> On the other hand, if you are building only a small X-Y PCB-drill,
> ACME-screws with Turcite/sprung preloaded nuts should do (mine works
fine!),
> with the 1/2" dia. x 0.125" pitch/4-start/0.5"-lead, screws turning.
>
>
> [Non-text portions of this message have been removed]
>
>
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