A Quebec manufacturer's torque loop at shift change
Context: A mid-size manufacturer near Trois-Rivières ran a cobot arm for palletizing. The control loop performed cleanly during day-shift bench tests. Within two weeks of floor deployment, operators reported oscillation during the 14:00 shift change — precisely when dock doors opened and forklift traffic increased.
Approach: RoboCircuit traced the hunting to a shared ground path that introduced low-frequency noise into the torque sensor feed. We rerouted shielding, retuned the control policy with deterministic timing checks and rebuilt the actuator driver integration layer. Computer vision-based collision checks stayed in the loop; autonomous grasping never ran without human-in-the-loop supervision during the four-week pilot.
Outcome: Oscillation dropped below operator-noticeable thresholds in supervised runs. A functional safety review documented remaining edge cases and CSA-aligned guarding recommendations. The client retained us for quarterly control-loop audits — not because the system was "done," but because floors change.