"Harold and Susan Vordos" wrote
in message ...

"Tom Miller" wrote in
message
...
I volunteer at the local science
museum,rebuilding old machinery. Mostly steam
and
early diesel tractors and road rollers. We have
a
pretty good shop with a selection older, but
good
solid machine tools. Among them is a Cincinnati
horizontal mill No.2 M1 ( serial F5409-6) made
in
1946. Another of the volunteers(No , it really
Wasn't me) pulled the gearbox selector assembly
off the side of it as the machine appeared to
be
seized. It appears that it somehow selected two
different gear ratios at once. It appears also,
that the gear selection is done hydraulically
by
pistons which push selector arms in response to
the position of a multi-port valve .The
question
is -how do you get the selector arms in the
correct position to re-assemble it. We will
probably have to replace the "o" rings on the
pistons as that is possibly why it selected two
gears at once.
Does anyone have any experience with this or a
similar machine? Am I looking in the correct
areas
and are my suppositions reasonable?

We spent 2 hours today (and a fair amount of
bad
language) trying to get those selectors in the
right positions to re-assemble it.


Tom Miller

I'm no help with your problem, Tom, but I
thought I might relate a similar
incidence, one with serious consequences.

Years ago, when I was in training, the company
had a #4 vertical Cincinnati
mill that, likewise, shifted hydraulically. On
several occasions, the head
would go from one high to low range. but not
when selected. Serious gear
damage resulted until our main machine tool
repair man found the problem,
which I don't recall.

Good luck with your repair. Sure must be
frustrating.

Harold



Thanks for the encouragement Harold. I'm pretty
sure that's why it jammed up, but I'm damned if I
can figure out how to get it all back together.
Maybe a nights sleep and it will all make sense.

Tom