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Re: Grasp planning for deformable objects - still mostly unsolved?
Posted: Tue Nov 19, 2024 2:57 am
by emilyperez
One nitpick -
Object occlusion by the robot's own hand during the final approach to a grasp is a common and annoying perception problem - the closer the hand gets to a good grasp position, the more it blocks the camera's view of exactly what it's about to grab.
Re: Grasp planning for deformable objects - still mostly unsolved?
Posted: Wed Nov 20, 2024 12:28 am
by zoeanderson
@emilyperez To answer this directly:
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. Underactuated hands (fewer actuators than joints, using mechanical coupling to shape the grasp) are a reasonable engineering compromise for robust power grasps on a budget, but they generally can't do fine in-hand manipulation the way a fully actuated hand can.
Re: Grasp planning for deformable objects - still mostly unsolved?
Posted: Thu Nov 21, 2024 9:56 pm
by scott21
@zoeanderson This raises a question for me -
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.
Re: Grasp planning for deformable objects - still mostly unsolved?
Posted: Mon Dec 02, 2024 11:53 am
by park44
This is exactly the kind of context I was looking for.
Payload-to-hand-weight ratio varies a lot across current dexterous hands, and it's a meaningful tradeoff - more DoF and finer sensing generally means more actuators and mass in the hand itself, which eats into the arm's usable payload budget.
Re: Grasp planning for deformable objects - still mostly unsolved?
Posted: Thu Dec 05, 2024 9:39 pm
by jhansen
@park44 Just to be precise about one thing:
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: Grasp planning for deformable objects - still mostly unsolved?
Posted: Wed Dec 11, 2024 6:04 am
by noah_pate
@jhansen This is exactly the kind of context I was looking for.
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: Grasp planning for deformable objects - still mostly unsolved?
Posted: Sat Dec 21, 2024 7:32 am
by kwilliams
This is exactly the kind of context I was looking for.
Underactuated hands (fewer actuators than joints, using mechanical coupling to shape the grasp) are a reasonable engineering compromise for robust power grasps on a budget, but they generally can't do fine in-hand manipulation the way a fully actuated hand can.