RE: [CAD_CAM_EDM_DRO] Positioning

Backlash can be measurably-brought to zero in a worm drive.


Errors from flexure, expansion, etc. cannot.


But those are not backlash.


Christopher Erickson
Consulting Engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com






-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com]
Sent: Monday, June 09, 2014 12:52 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Positioning

On Mon, 09 Jun 2014 13:48:52 -0400, you wrote:


>On 06/08/2014 03:42 AM, Steve Blackmore steve@...
>[CAD_CAM_EDM_DRO] wrote:
>> The mythical zero-backlash - you mean low backlash?
>>
>> Steve Blackmore
>
>Actually, Steve, zero backlash IS possible, but the caveats which go
>with it are non-trivial. It usually only works over a very limited
>range of loads and zero ERROR is not possible.


Actually - it's not, unless you weld the components together. Some
allowance must be made to allow for thermal expansion, rolling/sliding
clearance and the lube film to prevent said components really welding
themselves together or wearing out very quickly.


It can be made very small, but can never be zero.


Steve Blackmore
--




------------------------------------
Posted by: Steve Blackmore <steve@...>
------------------------------------


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@... davemucha@...
[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


Yahoo Groups Links