Robot Arm and Controller

www.frtech.fr/

www.frtech.fr/Robotcontrolsystem

I heard that this controller runs on Linux. I only saw the web based interface to the controller so I did not reach a command line to be able to check. The robot arm is very jittery through some motions. I read on some other forum that the way they fixed it was to replace the motors and drives and run it with LinuxCNC. I can easily do this but I am wondering if anyone else here has worked with these robots or controllers before and what their experiences were. Does this actually run Linux?
 

The specs they list for that mini control box makes me think it is a servomotor amplifier. I see ratings of 48VDC 42A max and 48VDC 104A max on several models of the control box shown at your second link.

Interesting possibilities.