Re: [CAD_CAM_EDM_DRO] no thrust bearing

Andrew,

Look at my web site and look in the section on machined parts.
www.campbelldesigns.com

Look at the bearing blocks that I use. What I do is to use two radial
bearings with a lip on them and press one in from both sides of the bearing
block.

I do this at both ends. On the far end, I preload the bearings with a
threaded end and a nut.

On the stepper motor end, I use a flexible coupler to connect the lead screw
to the stepper motor.

To answer you question, I would always use bearings in some type of bearing
block. You will also need to use a nut on at least one end of the screw.

Bob Campbell

----- Original Message -----
From: "andrewyslee" <andrewlee@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, April 17, 2003 8:09 PM
Subject: [CAD_CAM_EDM_DRO] no thrust bearing


> Hi,
>
> I am looking at some plans which have the leadscrew hanging free at
> one end and directly connected to the stepper motor shaft end at the
> other. I had read in previous post about thrust bearing, and vaguely
> remembered someone mentioning that the stepper motor bearing cannot
> take axial load. However, I was also told that if I am not cutting
> metal, I wouldn't be dealing with very high forces.
>
> Will connecting leadscrew directly to stepper motor shaft lead to
> much shorter motor life?
>
> Thanks
>
> Andrew
>
>
> 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/
>