"JMartin957" wrote in message
...

I have a new to me Hz mill. In the package were three arbors, one 1" and
two 1 1/4". This mill, a Dufour, French made, has two round shafts for
the
arbor support like a K&T. The arbor support hole is 2" bushed to 1 3/4"
with an oillite or brass bushing, Within this bushing is a roller
bearing
that has a bore of 1". 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.
SNIP


Most arbor supports I've seen use a plain bearing (bronze bushing). Do
your
arbors have reduced size pilots on the end to run in a bearing?

No reduced end. These are a type B arbor As near as I can figure looking in
the catalogue.

Using the ball bearing locked into the arbor spacers might give you some
problems as the arbor heated up.

The inner race on this bearing will move horizontally and should handle any
small expansion issues.


Who knows, though. After all, you did say the mill was French.....

John Martin