Re: [CAD_CAM_EDM_DRO] Power Transmission? was: Does this make sense?

Jon,

I'm having trouble understanding what you mean by "power transmission
grade".

I have something similar to this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2549803136&category=12577

Can you send a link to an example transmission grade one that I can actually
see?


Vince

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, August 12, 2003 11:01 AM
Subject: Re: [CAD_CAM_EDM_DRO] Does this make sense? was Re: Bent
Nookballscrews ?????


> But, a number of people are using "power transmission grade" ballscrews
> (with bends, bows or even KINKS in them) and 2 separate nuts to make
> a homemade anti-backlash nut system. I think you HAVE to have compliance
> in these, especially if "tight spots" are discovered in the travel.
> You don't want a bunch of screen-door springs, you need something with a
> real high spring rate, like thick Bellville washers or something like
that.
> If the pitch variation is so slight that you can tolerate the backlash in
> some areas by setting the fixed preload to just not bind on the tightest
> part, that is best.
>
> But, I am totally convinced that putting a heavy preload force between two
> ball nuts by some spring-like mechanism will not cause a torque load
> on the screw of the same magnitude as delivering that same force to
> an external axial load. If Mr. Lux would care to drop by my shop, I
> am pretty sure I could throw together a demonstration of this in a couple
> of minutes that he would be absolutely unable to refute.
>
> Jon
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: 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@...,
timg@...
> Moderator: pentam@... indigo_red@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> 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
>
> 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
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>