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Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by diego.moore6
@niklas29 I dealt with almost this exact situation.
Grasp planning for deformable or non-rigid objects (bags, cables, cloth) remains one of the genuinely unsolved problems in manipulation - rigid-body grasp models simply don't capture how the object will behave once contact starts.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by deborah59
@diego.moore6 Side note that might be relevant:
A lot of the manipulation shown in production demos still leans heavily on teleoperation, particularly for anything involving fine force control or novel objects - autonomous grasp success rates on genuinely unstructured, previously-unseen clutter are still well below what teleoperation can achieve. Cable routing through a wrist joint with multiple degrees of freedom is a genuinely tricky mechanical design problem - tendons and wiring both need enough slack to avoid binding through the full range of motion without tangling or fraying over thousands of cycles.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by servosan90
Sorry if this is a basic question, but
Compliant wrists that absorb impact during a bad approach or misjudged contact reduce mechanical stress on the whole arm, which matters a lot for long-term reliability even though it's a less visible feature than the hand itself. Tendon-driven fingers let you move the heavier actuators back into the palm or forearm, keeping the fingers themselves light and fast, but they introduce cable routing, tensioning, and long-term wear problems that direct-actuated fingers don't have.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by elarsen
@servosan90 Worth being a little skeptical of the marketing angle here.
A lot of the manipulation shown in production demos still leans heavily on teleoperation, particularly for anything involving fine force control or novel objects - autonomous grasp success rates on genuinely unstructured, previously-unseen clutter are still well below what teleoperation can achieve.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by byang
Counterpoint:
Wet, oily, or otherwise low-friction objects are still a genuine edge case for most current hands, since tactile sensing and grasp-force controllers are typically tuned and validated on dry, higher-friction test objects. Cable routing through a wrist joint with multiple degrees of freedom is a genuinely tricky mechanical design problem - tendons and wiring both need enough slack to avoid binding through the full range of motion without tangling or fraying over thousands of cycles.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by karentaylor
@byang Yeah, this tracks with what I've read as well.
Tendon-driven fingers let you move the heavier actuators back into the palm or forearm, keeping the fingers themselves light and fast, but they introduce cable routing, tensioning, and long-term wear problems that direct-actuated fingers don't have.
Makes me wonder how this looks in another five years.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by joseph.robinson
@karentaylor Small correction on one detail:
Figure's fourth-generation Dexterous Hand (on Figure 02/03) reportedly offers 16 degrees of freedom per hand with sensors integrated into each finger, aimed at fine force control tasks like handling small electronic components without crushing them.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by ethan.lewis5
@joseph.robinson This matches what I've seen too.
Vision-based grasp confidence estimation (predicting success before attempting a grasp) and tactile-based confirmation (confirming after contact) are complementary rather than competing - vision helps you choose a grasp, tactile tells you if it actually worked.
Re: How much does object symmetry actually simplify grasp planning in practice?
Posted: Sun Aug 30, 2026 11:59 am
by gimbalyuk55
Genuine beginner question -
Vision-based grasp confidence estimation (predicting success before attempting a grasp) and tactile-based confirmation (confirming after contact) are complementary rather than competing - vision helps you choose a grasp, tactile tells you if it actually worked. Grasp planning for deformable or non-rigid objects (bags, cables, cloth) remains one of the genuinely unsolved problems in manipulation - rigid-body grasp models simply don't capture how the object will behave once contact starts.