"Ned Simmons" wrote in message
...
On Mon, 17 Sep 2007 21:34:28 -0500, "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


The preload should be pretty low, perhaps 30 to 100 pounds of axial
force. If it's too loose you'll get chatter, too tight and the
bearings will overheat at high speeds.

First question is how is the preload determined? Spacers, shims,
adjusting nut, or something else?

--
Ned Simmons

Ned: There is an adjustment nut with a tabbed washer that is bent into the
nut to lock it down once adjusted.
thanks, John