[cglrcng]

Check w/ an OHMMETER between the hot lead and the case on that banebot motor w/ the sound signal on...Get sound, then that case is certainly grounded.

There has always been a quality control issue w/ those particular motors and we have received many in the past that were brand new and had fine metal debris inside the case that led to case shorts right out of the box. We devised (actually copied from others here and on YouTube, and improved for safety reasons), a way to fix them and actually be able to use them.

It must be done very carefully (w/ 2 people at least...1 manning the switch for a quick emergency shutoff, one working the actual motor fix procedure).

On a plywood board out of a robot on a table or floor...We hooked up a battery to a robot 125 AMP switch to a power board, ran a set of leads (12 gauge wires), from a 20 AMP breaker spot on the power board (w/ the breaker in of course)....Then we attached the ground lead to the ground side of the Banebot motor that we knew was case grounded, put on the face shields, welders jackets and safety glasses.....(Got the 1 man ready to immediately trip the switch and cut off the power real fast should the hot lead decide to weld itself electrically to the case during the "fix" swipe...It never happened in our many attempts, but, it certainly could happen so be very aware of the possibility, and be ready to act fast if it does)...then we quickly swiped the hot lead against the case of the motor. There was an electrical short connection in each case and you could hear an internal "loud pop" (some sounded like gunshots), sound as the debris that had originally made contact inside the motor between the case and windings was removed/dislodged, burned and blown away in each case that we attempted that fix of an actual case grounded motor....we then blew out each motor well w/ compressed air, and then checked each motor again for case ground situation w/ the meter and then operation of the motor.

No more case grounding issues w/ those motors...and each of those motors fixed in that manner worked fine from then on (except the very first one of course, that I took apart and disposed of, to actually find out what was originally wrong w/ those motors in the first place, (which was noted as minor metal debris between very close tolerance areas of case / windings).....We must have received at least 80% of a large number of those purchased in batches a couple of years ago, were received in that case grounded condition, brand new. (Just MFG. quality control issues to be sure).

We fixed many of those that way.....Not the most comfortable or safe fix, but a fix that actually works. (We may have some of the fixed versions brand new w/ leads soldered to them, that we are not using this year, that we bought as spares 2 years ago that our team just may be willing to let go of if interested).