Re: leadscrew bearings / machine design(2nd gif dwg)

Peter:

Thanks for taking the time to respond. I've looked throughout the
links you've provided, and there is a wealth of information there.

Unfortunately, the engineering drawings presented there are typical
of what I've found in the supplier documentation. The drawings show
the vendor's part in great detail, with phantom bearings (and spacer
in Nook's case) for reference, however the structure to support the
bearings and define an entire 'typical' installation is not shown.
The drawings are very useful, however they stop short of detailing a
buildable installation. My questions have revolved around the actual
clampup of the bearings, and the required 'typical' support structure
to react the thrust loads.

In an effort to save someone a post, I acknowledge the obvious that
the supplier cannont design my installation for me. Thats not what
I'm after, rather I seek simple, generic, 'typical'
installations...similar in detail to the stackup dwgs recently posted
in the Files section.

I did find a very interesting exploded view of Nook's EZ Mount, which
is their off-the-shelf implementation of exactly the structure I am
building. Typically however, they show the stackup of the spacers and
bearings for a FIXED mounting block, and omitt any section
information from the mounting block itself. So while it makes a very
nice drawing of the internals, no information on the actual clamp up
mechanism is available.

Thanks again for your time.

Ron

--- In CAD_CAM_EDM_DRO@egroups.com, ptengin@a... wrote:
> In a message dated 10/24/2000 11:55:06 PM Hawaiian Standard Time,
> r_fl_z@h... writes:
>
> << The one advantage to the B method of using two bearing
> retainer plates is the increased distance between the bearings,
for a
> given thickness of support plate. The disadvantage is the
counterbore
> required to engage the inner bearing's outer race.
>
> The disproportionate scale results from never having seen one :)
>
> Ron
>
> >>
>
> Ron,
>
> In some designs I have worked on, they space the bearings far
apart but put
> a spacer tube between the outer rings of the bearings. Most time
they use a
> single end counter bore, the retainer plate on the outside clamping
both the
> outside bearing and the inner via the tube. This of course is a
much easier
> part to machine than the double counter bored. I've posted it
before but
> there is quite a bit of this info on-line at <A
> HREF="http://nookind.com/pdf/powertrac.pdf">Nook</A>. It's in PDF
format but
> it is very complete. They have many other files but it is difficult
to find
> on the site. Look at this page <A
> HREF="http://nookind.com/download.cfm?section=powertrac">
> http://nookind.com/download.cfm?section=powertrac</A>. It has
pictures, cross
> sections of the bearings and the housing used. Also, specs for
typical
> ballscrew ends are shown. Hope this helps.
>
> I have the NSK and THK ballscrew catalogs also. These two have
complete shop
> drawings for almost all their ballscrews and paraphernalia. No
need to
> invent your own, just scale down for smaller machines etc. Try
calling or
> writing to them as e-mailing does not seem to get a serious
response from
> them.
>
> Peter
> THRD, Inc.