On Sep 17, 9:34 pm, "John D. Farr" wrote:
Greetings and thanks for reading this. I have disassembled the spindle of my
Enco 20 inch square column mill-drill to replace the pins that prevent the
collet form slipping. Now I need the procedure for preloading the bearings.
The "manual" is worthless. Any ideas? thanks, John

All posts are good advice. I would add that it is a good idea, on
tapered bearings, to go a little beyond what would seem to be good for
the preload, rotating the shaft a little as you go, to ensure the
seating of the bearings, then back off and make the final adjustment.
If you have adjusting nut, etc.