Once pick orientation and vacuum gripper are selected, suction grasping is open loop, relying on suction force and compliance of gripper and object.
Mostly true True in substance, wrong in a detail.
Factual: Statements about the present or the past, checked against the record: did they hold up?
The second judge would not resolve this claim; the verdict shown is the first judge's.
What would count as true or false
True if robotics literature and industry practice confirm that in typical suction-cup picking, once the pick pose and cup have been chosen, the grasp itself runs without closed-loop feedback adjustment and depends on vacuum force and the compliance of the cup and the object. Mostly true if this holds in general but common systems use some limited feedback during the grasp, such as vacuum-pressure sensing to detect a seal, that the claim glosses over. Mixed if a substantial share of deployed suction systems use closed-loop control during the grasp. Mostly false if closed-loop suction grasping is the norm and open loop applies only to simple systems. False if the evidence shows suction grasping is generally closed loop after cup selection.
Set before the research began.
Evidence (4)
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E1 Robotic gripper with seal detection Google Patents · 17 November 2022
“The quality of the seal of each vacuum assembly may be investigated, and vacuum assemblies that are determined to have a poor seal (or no seal) may be deactivated.”
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E2 Robotic gripper with seal detection Google Patents · 17 November 2022
“In some embodiments, a status of one or more vacuum assemblies (e.g., a status of the deactivated vacuum assemblies, or a status of all vacuum assemblies) may be monitored throughout the duration of a grasp.”
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E3 Robot Gripping Strategies: A Comprehensive Technical Reference | RBTX Learn by igus(®) igus RBTX Learn · 29 October 2026
“Vacuum systems need a valve output and a vacuum sensor input to confirm grip before the robot moves.”
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E4 Robot Gripping Strategies: A Comprehensive Technical Reference | RBTX Learn by igus(®) igus RBTX Learn · 29 October 2026
“The theoretical holding force equals vacuum pressure multiplied by the effective sealing area. In practice, actual holding force runs at roughly 50% of that theoretical value.”
Reasoning
An industry technical reference says vacuum holding force comes from vacuum pressure times effective sealing area, which supports the claim that suction grasping depends on vacuum force and the contact between cup and object (E4). The same reference says vacuum systems use a vacuum sensor to confirm the grip before the robot moves (E3). A patent describes checking the seal of each cup and monitoring the cups throughout a grasp (E1, E2). That is the limited feedback during the grasp, such as vacuum-pressure seal sensing, which the criteria count as "mostly true": the claim holds in general but glosses over it.
Cite this claim
Rodney Brooks, “Once pick orientation and vacuum gripper are selected, suction grasping is open loop, relying on suction force and compliance of gripper and object.” (said 1 January 2026). Verdict: mostly true. Reliability API, claim c_9bac81def002, method 0.1.0+c876030c, dataset release v1.1.2. https://epistacklabs.com/claims/c_9bac81def002
This claim is in dataset release v1.1.2, with the same verdict.
Reply to this claim
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Verdicts are made automatically; how verdicts are made.