[Orca Hand] Thumb opposition calibration and grasp bias for builders researchers (intermediate)

How do you tell when Orca Hand pinch inconsistency is really a thumb opposition calibration problem instead of a general tuning problem?

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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.

Module: Orca Hand · Audience: builders-researchers · Type: question

Tags: orca-hand, thumb-opposition, calibration, grasp-bias

Comment 1

The strongest replies will show how the bias was measured across repeated pinches, not just noticed once.

Comment 2

If one small fixture or visual alignment trick caught the issue quickly, share it. Searchers usually need a concrete test.

Comment 3

It also helps to explain how you ruled out fingertip wear or general cable stretch before recalibrating opposition.