Re: [CAD_CAM_EDM_DRO] Re: Looking for short ballscrew

What if you used a servo motor on the fine feed wheel input, but ran a cable
to a clamp on the quill. This cable then runs over a drum attached to an
encoder. Now you have no backlash in your system.

-Greg

----- Original Message -----
From: "Jon Elson" <jmelson@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, December 01, 2000 1:08 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Looking for short ballscrew


>
>
> Jon Anderson wrote:
>
> > Smoke wrote:
> > >
> > > If you MUST drive the quill for your Z axis on a Bridgeport, I don't
> > > see why you don't simly mount a pulley on the quills hadn feed and
> > > run a belt to a stepper motor mounted on a bracket.
> >
> > This might be fine for a hobby setup
>
> There is often .050" backlash from the fine feed handle to the quill
> movement. You have a shaft keyed to a worm, worm wheel keyed to
> shaft to overload clutch, overload clutch keyed to inner shaft keyed
> to pinion, pinion to rack. Also, there is no expectation the quill
> rack is ground to any sort of accuracy. I can';t imagine there would
> be any use in putting an encoder or stepper on this. Might as well
> just have a dc gear motor, or leave the power feed mechanism as is.
>
> I can't even imagine any hobby use for something with .050"
> backlash.
>
> Jon
>
>
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