Re: leadscrew bearings / machine design

Ron,

You might take a look at Sherline's notes for installing CNC motors to a
mill/lathe.

http://www.sherline.com/6700inst.htm

OK, it's not "BIG MACHINE" stuff, but if you are building your own, this
might explain it.

Alan

r_fl_z@... wrote:

>
> Ballendo :)
>
> Informative response. I agree that due dilligence can divulge many
> design detials, but not all. For instance, it is still unclear to me
> what the exact stack-up for the lead screw end away from the motor
> looks like. I understand the screw strength and stability issues as
> relates to the fixation method. As a result, I plan on using a
> double bearing within the common bore as you described. It is not
> clear to me what you are saying about the shim washers. I expect
> that a spacer would be required between the bearings in order to
> bring them flush to the surface of the plate they are mounted within.
> What I can't seem to get is exactly how the bearings are retained, or
> the load path to remove the thrust load.
>
> Unfortunately, the manufacturers seem to show cartoons of common
> bearing arrangements, but they ommit the entire stackup...showing
> only the lead screw and the bearings. No retainment details are
> provided.
>
> Thanks for your time.
>
> Ron
>