52 Ford: I considered angular contact bearings, it would be a good choice. in the end I installed the same bearings as original since they last a long time even being mis-used. Many hundreds of hours at 10k rpm. When they do start to whine a bit there is still no play, and no urgency...
I have a Taig CNC mill that I have used for the last 17 years. Yes, it is incorrect to side load deep groove ball bearings like the Taig does for the spindle, but I have only changed those bearings three times over the years. Cost is about $20 and few hours time.
I have often thought about a...