On an old Acroloc, we had a rumble in "Y". Solved it by cleaning the
tachometer brushes. They were at the rear of the drive motor. Ten years ago.
Memory fades...


Beege

"Jon Elson" wrote in message
...
Hello, all,

We have a Bridgeport/Romi EzPath lathe at work that has a "rumble"
in the Z axis servo. I tweaked some pots on the servo amp and
got it to quiet down so that the machinist is real happy with it,
but I think it could be better. First, I have no idea what those
pots do, as the labels are beyond cryptic. There are 3 pots there,
VC, BL and CC. I'm guessing that maybe VC is velocity loop compensation,
and CC is current loop compensation. This machine
has the SEM motors typical on the Bridgeport machines, and drives
the leadscrew by a coarse toothed belt. I'm wondering if the belt
is wearing or needs the tension adjusted?

Anyone have a servo adjustment procedure for these? (It has the
servo amps that are roughly 4" square boards mounted on a bent
piece of metal, with the power transistors mounted on the bent
part. No sign of a manufacturer or model number on them.

Thanks,

Jon