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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