Re: Pre load specification

Hi Ron:

You do not specify preload. The manufacture grinds the bearings so
you can bolt them tightly together. This will give the bearings the
proper preload. No fuss, no muss.

Wally K.

--- In CAD_CAM_EDM_DRO@egroups.com, r_fl_z@h... wrote:
> Wally,
>
> What I meant was, how is the PRE-LOAD specified? Thanks
>
> Ron
>
>
> --- In CAD_CAM_EDM_DRO@egroups.com, "Wally K" <cnc4me@u...> wrote:
> > --- 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.