router plan with plotter servo motors

Hi
I am considering to build a hobby CNC router. The plan I have uses a
18" x 18" XY table. I also have picked up two servo motors with
encoders from an obsolete Calcomp 1043 plotter. I still have to get
the third motor and then the electronic equipment that will run it.
I have no specs on the motors and only can give the following
information. The manufacture date of the plotter was approximately
1985 and the OME motors came out of Universal Magnetics Inc. The
Calcomp Company and Universal Magnetics Inc. do not exist today. The
OME label on the motors gives the following information:
10211-301-000
ME21026017 8551
The length of the DC brush type motor with encoder is approximately
5 inches and diameter close to 2 inches. The brushes are at least
1/4" long.
I believe that the above type of motors are still made today.
I will greatly appreciate information from anyone who can give me an
idea how to test them, what the working specs can be and what
electronic equipment would be required.
Sincerely,
Oly