Using older servos with new controller

My group has a three-axis stage controlled by an old Galil DMC-230
motion control board, Galil ESA-10-75 amplifilers and three dc servo
motors (from Galil too, I think). The board is mounted in an
ancient computer running DOS. To make matters worse, the hard
drive seems about to give out. We would like to leave the stage
and motors alone but replace the controller and amplifiers. We
are considering using an NI PCI-7344 controller with an NI MID-7604
Motor Drive.
My questions are:
What are the main things to consider when matching a servo motor to a controller?
Has anyone done anything similar (using older servos, but replacing controller and drive)?
Should I just give up and beg the boss to buy new motors as well?
Thanks for any advice!
Telemaque

Been there and almost done that. We have a legacy DOS Galil based (DMC-630 controllers with SSA-12/40 drives) system with brushed servos that is on it's last legs.
Matching servo to drive amps- look at max currents, voltages, and inductances on the motors to see if drive can accomodate. Are they brushed or brushless motors. Also check if encoders and hall signals from existing motors and limits from stages compatible with new controller.
Personally, I would suggest new motors since you may not know their history of (ab)use and depending on their ratings, may be a minor percentage of total retrofit cost. You may also want to have the stages sent out for refurbishment if time permits. They have probably seen a lot of use with little or no cleaning and lubrication. Mechanical wear also takes it's toll. On the system I mentioned above, we were experiencing loss of accuracy and repeatability- the lead screws and nuts were trashed.
Just a couple ideas to start with.
Good Luck
AK2DM
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"It’s the questions that drive us.”
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Using older servos with new controller

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