Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Step resolution question, dividing head

Hi,

Why not use a home-made worm and wheel to drive the dividing head - easy to
make using a screw threading tap and can be adjusted to remove all backlash.
It wouldn't matter too much if the ratio was greater than you have
calculated for pulleys/gears, it would just enable you to use easier motor
drivers (full/half step) or give greater resolution. See earlier posts and
files in the dropbox for more details on technique)

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Jon Anderson" <janders@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 01 March 2001 20:52
Subject: Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Step resolution question,
dividing head


> beer@... wrote:
>
> > Try making your own. Then tell me how you did. I'm in exactly the
> > same boat, just about to CNC my ( homemade ) indexing head. I'd like
> > a REALLY big pulley, but
>
> This isn't my first choice. The 4:1 ratio on my dividing head works
> great for most normal machining, but I can't get many of the fine
> increments often needed for gears and toothed pulleys. I'll have to go
> borrow one, and all told, I'm WAY ahead if I can buy parts.
>
> IF however, I had to cut one, I'd use a microscope or other good
> magnification, and grind a flycutter to match a pulley of similar size
> to what I wanted. I really don't want to go there....
> I cut a cast iron gear for a friend's Delta lathe once.
> It was fun but a lot of work.
>
> 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@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
> FAQ: http://www.ktmarketing.com/faq.html
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>