Quote Originally Posted by phill05 View Post
mount the 12mm chuck in the lathe and skim a tad off between the bearing seats this will aid pushing through, freeze the part no need to heat the motor, should go in a treat have used this method myself.
That means skimming a tad off ('bearing relief' is the term I think) in three places. I may well do that. I'll need to accurately measure the bearing positions. I did it on the shaft for the tapered roller bearings on my wind turbine and that was effective. Though that time I made the shaft/housing from scratch...machining 80mm steel bar down to 25.4 took a while!

If the bearing did get stuck half way I can always use my big milling vice as a press. I'll go and machine a tube thingy to push the angular contact bearing on so I don't damage it.

The collet chuck is in the freezer now.