"Gunner" wrote in message
...
On 27 Dec 2004 21:06:56 -0800, wrote:

I just took the spindle apart on my Sheldon and noticed on the rear
bearing that there is a dimple on the face of the bearing race. I have
heard that some precision bearings have a reference mark like this on
the bearing and it must be placed a certain way, either up or down. Any
one have any suggestions on how it should go back in? I assume the
front bearing has the same mark but it is still pressed on the spindle
and I caanot see the inner face of the race.

Thanks, Steve

whoops..hit send too fast.

Ive never seen a set of high precision roller bearings however.
Virtually all such grade 7 or 8 will be angular contact ball bearings,
so I doubt that these rollers were ground together.

I may be wrong, and if so, Id appreciate it if someone speaks up. I
dont do many machines with roller bearings in spindles.
Least, not the smaller high precision ones


I havent worked with tapered rollers in quite a while, except for in the
case of wheel bearings and such, so my reply is for Gunner, and concerns
angular contact bearings mostly.

Angular contact bearings have "arrows" that should be lined up,
particularily when they are mounted in a duplex arrangement with the pairs
contacting each other or physically located within a close distance from
each other on the shaft being separated only by a pair of short spacers.

The way I understand it, ( and I might be wrong ) if you were to hold the
inner race stationary and spin the outer, the arrows will show you where the
"high point" is at..........

These arrows also serve as a secondary reminder for to aid you in getting
your thrust directions correct--very bad news if one out of a pair were to
get mounted backwards...........

Looks like AHR has many of the legacy bearing manufacturing companys and has
consolidated them under their RHP product line--tons of excellent technical
data on their website if one takes the time to root around a bit.

http://www.ahrinternational.com/rhp_bearings.htm

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SVL