Re: [CAD_CAM_EDM_DRO] Making leadscrews more accurate

On Jan 5, 1:48pm, Les Watts wrote:

> Subject: [CAD_CAM_EDM_DRO] Making leadscrews more accurate
> > Les wrote:
> > >Rather than XXYZ control the minor pitch variation between the two x
> > >screws is taken out by a simple cam/rotating ballnut.
> > >It's an old victorian trick to make a leadscrew's pitch more
> > >accurate than it was manufactured to.
> >
> > Les,
> >
> > Please tell us more about this! And/Or post links/Refs??
> >
>
>
> Well I have no links because I know of no other one that has done this. I do
> seem to recall reading about the early machine makers in the 1800's using
> this technique to make leadscrews though. (Maudsley?)

Very nice description snipped.

Back in the good old days (early 70's) when I was a machinist at Lawerence
Livermore Labs we had some Ex-Cello T lathes which used this same technique.
Calibration was done with laser interferometers and the cams were filed/stoned
on the machine.

>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.rabun.net/~leswatts/wattsfurniturewp.html
>
>-- End of excerpt from Les Watts

--
Drew Rogge
drew@...