Re: Pre load specification

--- In CAD_CAM_EDM_DRO@egroups.com, r_fl_z@h... wrote:

> How are ground pre-loaded bearings ordered/specified? Is the

preload

> specified in thousands of an inch (or similar)? I believe Ballendo
> said they could be ordered from the manufacturer pre-ground, is

this

> what is typically done, or is the preload accomplished by the end
> user? Finally, how is the preload inspected? For instance, since

the

> torque on the lead screw nut affects the final preload (as I
> understand it), how is the nut torque chosen? How does this torque
> relate to the final pre-load?
>
> Thanks in advance,
>
> Ron

The ground preloaded bearings are not specified by thousands of an
inch. They are found in manufactures catalogs under the name
of "angular contact thrust ball bearings" You pick them by the shaft
diameter. In the INA catalog there are 2 bearings to choose from for
every shaft size. The differance being the size of the outside
race. The larger race has slightly better loading. Quick look says
loading varies from about the same to 40% better depending on the
bearing. Prices for 17mm to 20mm bearings are from $17USD to $24USD
depending on the shield options.

Wally K.