petermichaux wrote

Hi,

Well I finally have a big enough break in the milling to take my mill/drill
apart to install the ballscrews I bought on ebay. I have four angular
contact bearings (7203BM, 17mm ID) to use in the ball screw supports. I have
to make the housing for the bearings.

Would aluminum for the support blocks be an absoultely hidious idea?

How tight a press fit should it be to get the bearings into the support
housing?

To preload the angular contact bearings, what can I use as a spacer between
the inside races? I was playing with aluminum foil and found that about 12
layers made it so I could still squeeze the outside races to touch. Should
the outside races be able to touch? How much preload is too much and how do
I measure it? Would layers of aluminum foil be ok for the spacers?

What can I use for the bellows to cover the ball screw and insure it doesn't
wear out prematurely due to grit and swarf? Is there some sort of accordian
plastic tubing I could use?

Thanks,
Peter