Tom,
Send me an e-mail to
reymac@earthlink.net and I'll scan the page when I get to work tomorrow and send it to you (.jpg if that's okay) The drives can be tuned fairly simply, there may also be a way to tune the signals the computer sends to the drives, I'll look in the book and see. We're right in the middle (at least we were) of swapping in a Galil controller with CamSoft software so since I no longer had the original computer I didn't look in the book to se if there's any computer tuning that can be done on the original computer.
On the Camsoft software you just change what's called the PID (proportional gain setting; integral gain setting; derivative gain setting) to take care of the servo problems like you're having.
The Factory computer would have PID too, I'll have to look in the book to see if it's anything that you can adjust.
On our mill the "Z" Gettys drive axis was acting jerky in both directions similar to what you were describing and I finally tried backing down the proportional gain setting 1 number at a time until it stopped acting up, and now it's as smooth as can be.
Pat