NEMA 42 DC motor, black case with either orange or blue back cap, back
cap smaller diameter than motor case.
Centroid CNC control sales, service, training and support
These are servo motors used in Centroid CNC controls from 1993 to present. Not all motors or all variants are pictured.
Note that many small-machine retrofits re-used existing DC servo motors. If you have such a machine, your motors were not supplied by Centroid and may not appear here.
Many machines were built or retrofitted using third-party AC servo motors and drives, with Yaskawa and Delta being most common. Those motors are not featured here.
This page is a work in progress. If you have specific questions or requests, please e-mail me. Also, if you have better pictures of some of these motors which you would be willing to share, please e-mail them to me as well.
NEMA 42 DC Motor, all gray, back cap same diameter as motor case.
Used on M10 and M40-family controls in 1993 and 1994. Also found on many retrofits.
These motors were all supplied with a 24-7 MS connector.
NEMA 42 DC motor, black case with either orange or blue back cap, back
cap smaller diameter than motor case.
Used on M10, M40, M400 and M39-family controls from 1994 to 2011.
Encoder stub shaft diameter varies. Early ones were mostly 3/8".
Later models were variously 1/4" and 6mm.
These motors were supplied both with 24-7 MS connectors and as direct-wired
motors (with a sealed strain relief for cable entry, and plug connections
inside the back of the motor).
Early and intermediate models were branded SEM. Late models (short blue
caps) were mostly branded Centroid, but still had the MTS30 model number.
NEMA 42 DC motor, all black, back cap same diameter as motor case.
Supplied in 29 in-lb (GM4030) and 40 in-lb (GM4050) models.
Used on M400S and M39S-family controls from 2004 to present.
These motors were supplied both with 24-7 MS connectors and as direct-wired motors (with a sealed strain relief for cable entry, and plug connections inside the back of the motor).
These motors are generally branded Centroid, but still have the GMxxxx model numbers.
Encoder stub shaft diameter varies, with both 6mm and 8mm being common.
Metric DC motor, all black, back cap same diameter as motor case.
Used on M400S and M39S-family controls from 2004 to present.
Also used on Hardinge HNC and CHNC lathe retrofits, with no encoder mounted to the motor (these controls used encoders on the ballscrew ends instead). When used as Hardinge motors, they were fitted with a gray PVC back cap.
These motors were supplied only as direct-wired
motors (with a sealed strain relief for cable entry, and plug connections
inside the back of the motor).
Centroid 10 in-lb
Metric DC motor, all black. I do not know the manufacturer. Centroid-fabricated PVC back cap, of larger diameter than the motor case.
Used on small machine retrofits (e.g. benchtop mills), ca. 2002 - 2010.
These motors were supplied only as direct-wired motors, using a strain
relief cap slightly smaller than usual.
Copyright © 2024 Marc Leonard
Last updated 30-Mar-2024 MBL
