My schedule has opened enough to make some progress on the robot welder. Yeah !
This remote amperage control will allow subtle power adjustments during the welding.
It plugs into the port normally used for the foot pedal remote.
Hopefully it will be one of those "small details" that makes a difference in weld quality.
Finding a suitable large enough potentiometer to match the needs of this old welding machine turned into a bit a treasure hunt. A modern welding machine won't need one so large.