I bought new bearings for the ball screws on my mill, SKF 7204 BECBP.
http://www.skf.com/skf/productcatalogue/Forwarder?action=PPP&lang=en&imperial=false&windowName=null&perfid=123002&prodid=1230020204

I have read conflicting information on how to install them.
It appears the best way would be installing them back to back, but I have read 
the inner rings should be clamped tight and also read the outer rings should be 
clamped tight when there back to back. 

I am not sure I understand the proload either and can't decipher what it is 
form the SKF website.

This is what I think I need to do, find what the preload is (weight) and 
measure the defection of the outer race when this weight is placed on the 
bearing.

Take this measurement X 2 and shim between the the races of the two bearings 
and clamp tight the inner rings and I will have the correct preload.

Do I have this right.
How do I find the preload

Your help is greatly appreciated,
Bruce

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