Re: [CAD_CAM_EDM_DRO] Re: NEW conversion project....

Marc: If this machine is a Bridgeport copy, I can tell you an easy way
to mount your motors. On the left end of the table there is a pot metal
or aluminum piece that holds the bearing in. It has three 1/4X20 socket
head cap screws. Your motor bracket can be mounted using those 3 screw
holes. The same on the y axis, but turned so that the mount is tilted 30
degrees. I put a stepper on my knee feed and used the same 3 holes. The
x mount is horizontal extending to the rear with the motor outboard the
y is 30 degrees down and to the right with the motor inboard. The z
(knee feed) is also horizontal to the left with the motor inboard. X & y
geared 2 to 1 with 3/4" timing belts. The knee feed is also at 2 to 1
but may go to 2 1/2 to 1 because some software rounds off the last digit
and produces some distracting numbers. This would give me .0002 rather
than .00025. I will probably mount a motor on the quill to use when I
need more speed as in drill cycles. But I like the idea of having a more
rigid setup with the quill all the way up and locked down. And the ways
on the knee are probably the least used on any machine so they should
have the least wear. Any way, if you choose to use the same approach to
mount your motors be aware that that alloy piece stays in and a spacer
is needed or a relief cut on the back of the mounting plate because it
is slightly recessed. I cut a relief groove in the back of my mounting
plate but you could also use a spacer plate or 3 washers to shim it out.

And don't get your mill torn down to the point where you can't use it to
make your motor mounts.