Terry,
Hello. The 4th axis drive measures 6.75" x 9" x 2". We usually install it on top of the servo3IO if there is enough depth to the cabinet.
As for the motors, both our 29in-lb and 40in-lb have 5/8" shafts. They are a NEMA 42 frame. These ratings are continuous torque.
Concerning the motors you have, I believe them to be too small. They are only about 11in-lbs cont.
On a typical 12 x 60 table, we would use the 40in-lb motors, belted 2:1.
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