I was looking at the manual for my powermatic drill press. It looks like
- it uses a 3/4" spindle
- Jacobs J33 chuck that threads onto the spindle (that is, this is not a typical morse taper way of attaching chucks, the chuck is firmly attached to spindle by a threaded collar)
- It uses two ZZ99R12 bearings to support the spindle (see page 13 of the manual, item 44 on the parts list).
I looked these bearings up. See McMaster item 60355K38, page 1083. The specs say, max RPM 10,700 (way over my maximum 4,800), max radial load1,787 lbs. They are made for side loaded electric motors like on belted compressors and meet ABEC-1 standards, whatever that is.
So, then, I am thinking that this drill press should be capable of being used for light milling, the chuck would not fall out like on morse tapered drill presses.
Powermatic manuals are on my PM webpage
Picture of the chuck is here:I would not want to ruin is and would like to hear some opinions. I may also call Powermatic company if this matter seems worth pursuing.