Re: [CAD_CAM_EDM_DRO] Motor sizing - revisited

Alan,
Thanks for the input. You're right about not worrying about backlash
in the downfeed, but my fine feed seems to work O.K. in a down direction,
but doesn't seem to want to retract correctly. I just thought of something
stupid. I'm going to put my cordless drill on the fine feed shaft, and see
if I can figure out what's wrong. I thought that motorizing the knee would
present fewer problems, since there's about 400 lbs. of downward pressure on
the screw, making for zero backlash. I'll keep you posted.

Marv Frankel
Los Angeles

----- Original Message -----
From: "Alan Matheson" <hokianga@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 25, 2002 3:24 PM
Subject: Re: [CAD_CAM_EDM_DRO] Motor sizing - revisited


> If youre only drilling holes through things does it matter if there is a
> little backlash.
> Its only if you need to go to a precise depth that you need to get
worried.
> Maybe you could aim at converting both vertical axes in the longer term!
> Alan Matheson
>
>
> ----- Original Message -----
> From: "Marv Frankel" <dcdziner@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Friday, October 25, 2002 10:56 PM
> Subject: [CAD_CAM_EDM_DRO] Motor sizing - revisited
>
>
> > Guys,
> > I've gone into the archives, and read the formulas for motor
> > sizing, and some of the replies, but I have a further question. My
> > Enco mill has pretty easy movement on the x-y axes, but I intend to
> > make the knee the z axis, and the cranking required to raise and
> > lower the knee requires considerably more torque. Do I use a
> > different size motor on z, do I do it by gearing, or both. I'm
> > thinking ahead to a particular project that requires drilling 10
> > holes through a piece of steel tubing. Can I cycle the z axis quickly
> > enough to do this in a timely manner? I don't want to use the quill
> > fine feed as z, because of an excess of backlash. Any suggestions or
> > experiences that might help my thinking?
> >
> > Marv Frankel
> > Los Angeles
> >
> >
> >
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
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> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
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> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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