Re: [CAD_CAM_EDM_DRO] Re: no thrust bearing

Andrew,

There are several on the list that have built inexpensive machines using MDF
for frames, drill rods and acme screws.

For attaching screws. You should be turning the ends to pass through a
bearing. One end should also be turned and threaded so that you can put a
nut on it and preload the bearings. The other end will need to be turned.
Once turned and supported by a bearing, it can be attached to the stepper
motor with a coupler.

Bob

----- Original Message -----
From: "andrewyslee" <andrewlee@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, April 18, 2003 12:20 PM
Subject: [CAD_CAM_EDM_DRO] Re: no thrust bearing


> Hi Bob, list,
>
> While not impossible, it is not like walking into Walmart/RadioShack
> when one wants to purchase things like linear rails, leadscrew, etc.
> The plans I am looking at uses drill rods for guide. No one here
> seems to know what a drill rod looks like.
>
> So, just to dip my toes in to find out what it is all about, I may
> try to make something simple with drawer slides and threaded rods
> which one can easily pick up at the hardware stores, then perhaps
> become more ambitious later. (I know there are lots of "professionals
> here, but anyone else went down this road in their "formative" years?)
>
> How does one attach a leadscrew/threaded rod to a thrust bearing?
> Does one just make sure that the diameters are a tight fit, or are
> there screws to tighten or something?
>
> Thanks
>
> In CAD_CAM_EDM_DRO@yahoogroups.com, "Robert Campbell" <bob@c...>
> wrote:
> > 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@s...>
> > 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
> > >
> > >
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timg@...
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>
> 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/
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