I believe our robot to be drifting. We have a chuck bolted to an xy-table bolted to our rotary table. The robot simply brings a tungsten in between two surfaces and starts pulsing as the rotary table spins. I ran about 80 parts before the weld begins to stop attaching to one surface as if maybe the robot is slightly drifting over time. I feel that I am just about constantly touching up points. Any ideas to test for drift? Almost feels like there is too much slop in the end wrist joint or J5 I believe.
I already double-checked our fixturing. Indicated the chuck, and it has remained dead zero over several hours of running, so shouldn't be our fixturing.