Re: [CAD_CAM_EDM_DRO] Re: Looking for short ballscrew

There is a system that works pretty well to eliminate backlash on the knee of a Bridgeport. It is called gravity. It is free and it
works every time. Even when you don't want it to. Sorry, I just couldn't resist.
Carey

Smoke wrote:

> Ah....commercial use....use the knee and mount a motor near the bottom then
> and you will be able to eliminate the bevel gears and backlash completely
> and still have use of the quill travel.
>
> Smoke
> -----Original Message-----
> From: Jon Anderson <janders@...>
> To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
> Date: Friday, December 01, 2000 11:36 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Looking for short ballscrew
>
> >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, but doesn't cut it for commercial
> >use. My customers don't cut me any slack on finish or tolerance just
> >because I have a funky old machine. I often need to hold +/-.001 on
> >depth, and I need the spindle located held securely to do that.
> >Driving through the rack means backlash in the gears, not to mention the
> >interesting task of deriving step resolution vs quill travel.
> >
> >Jon
> >
> >Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems, for CAD, CAM, EDM, and DRO.
> >
> >Addresses:
> >Post message: CAD_CAM_EDM_DRO@egroups.com
> >Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> >Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> >List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> >Moderator: jmelson@... [Moderator]
> >URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> >FAQ: http://www.ktmarketing.com/faq.html
> >bill,
> >List Manager
> >
> >
> >
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager