Re: [CAD_CAM_EDM_DRO] Re: Z axis conversion

Only time I have that problem is when I forget to loosen the vertical way
lock.

This can be eliminated by using "fixed" bearing mounts on both ends of the
ball screw and putting in the antibacklash screw I didn't think you'd need.

Obviously all these problems have been solved, since someone is already
selling machines built that way.

Smoke
-----Original Message-----
From: Wally K <cnc4me@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Monday, November 27, 2000 3:28 PM
Subject: [CAD_CAM_EDM_DRO] Re: Z axis conversion

>Joe Vicars wrote:
>> In my opinion, gentlemen (and ladies) the "knee" will not make a
>> good "Z". The quill bolt ons I agree aren't great, but you get to
>> messing with that knee and you'll regret it. There is a bevel
>reduction
>> gear in there (that's about 2:1) so there is some backlash. Even
>though
>> I think Smoke is right about not needing a anti-backlash nut. So,
>you
>> have to get all that out of there and fit a motor up inside the knee
>> somehow? I don't think so.
>> Not to mention you have to move 3 big castings, the knee, the
>table,
>> and the saddle. All together 500 pounds at least! Crank on that
>knee
>> up and down several times a day, it's a good workout. You're going
>to
>> put an awful load on any reasonable sized motor.
>> The Knee Way? No way!!!!
>
>
>
>Wally K. replys
>
>First if i was going to power the knee i would do it like the X and Y
>axis and mount the motor were the hand wheel goes.
>
>Second i am worried about "sticktion" of the knee. I remember now,
>somtimes when i crank it down quickly it will jump a little. what
>happens is as the backlash is taken out the screw pulls on the knee
>and the knee falls with a clunk.
>
>
>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
>
>
>