re:Re: Pre load specification (leadscrew bearings)

Ballendo,

I appreciate you taking the time to respond.

<<snip>>

>
> Pre-load is expressed in ounces,lbs., or kilograms. You should
> determine what the forces acting on the screw are, and "add-in"

some

> additional load capacity.

This is what I'm after. Does one specify a numeric value for the pre-
load when specifying the bearing? Or, does one simply specify "pre-
loaded matched set", or similar, and expect to get a bearing set of a
standard pre-load value?

If one is to consider the bearing pre-load in the design, how is this
done? With known design loads on the bearing installation, how is
the preload incorporated into the analysis? Is there a quantified
methodology to relate this desired preload to the torque of the lead
screw retention nut? Something more exact than "a couple of grunts"
on the nut.

>
> Someone asked which bearing should be "handling" the thrust load?

If

> you use the bearings as described, one will carry the load one
> direction, and the other will carry the load in the other direction.
> (true whether they are in contact OR spaced apart)
>

Acknowledged.
That question asked which of the two lead screw support plate bearing
installations should react the thrust load, i.e, the one near the
motor or the other.

> Hope this helps.
>

Absolutely :)

Ron