I also don't know. I suspect that different mills used quite different schemes.

On my little Benchmaster, the outer end of the 1" arbor is turned down a
bit smaller than the root of the arbor nut thread, and extends perhaps
1.5" past the nut. Thus one can install the cutters and spacers, install
and tighten the nut, then swing down the outer overarm arbor support and
slide it over the end of the arbor. The arbor runs in a bronze bearing
in the overarm support.

If needed/desired, the overarm to knee brace is then bolted to the outer
overarm support.

Dan Mitchell
==========

Fdmorrison wrote:

"larry g"

Wrt overarm support for horiz mill

So I'm assuming that when running the 1" arbor I
set up the spacers and cutter as needed and put the arbor nut on the outside
of the roller bearing using the inner race of the roller bearing as the last
spacer.

? I don't know. But, seems to me the spacer/cutter setup should be locked up
independent of the outer-end bearing support for the arbor.
The old way was to have a dead center bearing on the arbor end, just as with a
lathe tailstock. The bearing had nothing to do with the spacer/cutter setup.
Frank Morrison