Re: [CAD_CAM_EDM_DRO] Re: Alternative shafts for linear bearings

robertokx wrote:

>
>I came across the site below for the plastic type bearings on
>aluminium shafts which I guess are similiar to the "Frelon" bearings.
>
>http://www.igus.com/drylin.htm
>
>I always tend to think that things made out of plastic are cheaper but
>I wouldnt be surprised if there cost was equivalent to metal bearings.
>

Ya, if it has a linear motion conotation, They know how to charge !

I can not see how the IGUS type can hold up as well as the Frelon from
the ones I've held in my hand at the shows. I know the Frelon ones
actually do something to the shaft after a breakin period. They slide
very smoothly after a while. I don't think the Igus do that, but could
be wrong.

I did not have any alignment problems,,, I started with tightening one
rail up, then the other. Things slid very smoothly. If you did have
misaligned rails, I can see the hassles, but they also offer bearings
with more "turnout" at the ends so it rides in the center more....

The Ceramic coated aluminum rails came to my mind because these are easy
to drill and tap. You can place them on a Thomson "low profile rail
stand" and use open bearings if one would like.

Chris L

>
>Thanks
>Robert
>
>
>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/
>
>
>
>
>