On Mon, 26 Mar 2012 15:19:10 -0500, Jon Elson
wrote:

Noddy wrote:



What I was wondering is how interchangeable are the top and bottom
halves of Series I & II Bridgeport heads?
Nope, won't work. The spindles are different. Due to the height
of the varispeed drive, the 2J spindle is longer, the splined part
sticks up higher to where the driving spline is. Then, the rest of the
spindle is a lot longer, so the longer drawbar is at the top of the head.
I'm not sure how many other critical differences there are, but this
is the big one.

The spindles are the same -- the difference is made up by a longer hex
on the drawbar. The length below the hex is the same for both the 1J
and 2J.

--
Ned Simmons