[Orca Hand] Thumb opposition calibration and grasp bias for builders researchers (intermediate)
Orca Hand discussion on thumb opposition calibration, grasp bias, asymmetric pinch behavior, and how teams restore stable multi-finger contact.
A common Orca Hand issue shows up as a subtle bias: the thumb never quite meets the fingers the same way twice, pinch direction drifts, and grasp outcomes become skewed toward one side.
How are you calibrating thumb opposition on Orca Hand when grasp bias starts showing up in pinch or in-hand manipulation tasks?
Please share how you detect opposition error, what measurements or fixtures help, and how you decide whether the fix belongs in mechanics, cable tension, or control settings.
If you reply, include one exact grasp-bias symptom and one exact calibration or adjustment step that improved opposition consistency.
The best replies here explain how grasp bias was observed repeatedly, not just once in a demo.
If a simple pinch fixture or visual alignment test helped, share it. Searchers often want a minimal calibration aid.
It is especially useful to explain how you separated thumb opposition error from fingertip wear or general cable stretch.