Timeline for Manipulator link applied torque
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Jun 1, 2015 at 15:47 | comment | added | Chuck♦ | -1 - He's asking about shifting the axis of rotation; this does matter; he needs the parallel axis theorem to update the moment of inertia tensor. If he wants a particular rotational acceleration, moving away from the center of mass increases the moment of inertia and thus increases the required torque. | |
| Dec 3, 2014 at 1:51 | history | edited | Ben♦ | CC BY-SA 3.0 |
clarify terminology with link
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| Dec 3, 2014 at 1:50 | comment | added | Ben♦ | Do not confuse a force acting at a distance to create a torque, and a pure moment. Imagine a body floating in zero gravity. If you apply a moment at any point, the body will always rotate about its CoM. It may also translate though... But perhaps i should change the terminology in my post above. | |
| Dec 2, 2014 at 18:34 | comment | added | CroCo | "A torque applied to a rigid body does not matter where it is placed" I think it does. Applying torque at the center of a rigid body is not exactly like applying it at the edge of that body. Would you elaborate a bit? | |
| Jul 7, 2014 at 4:12 | comment | added | andrey | It is more about changing a pivot point. Picture this, on link has pivot point at the center of mass and another at the beginning. The torque has the meaning of applying some force relative to a pivot point (or an axis we chose to be a rotation axis and calculate the inertia tensor for this particular axis). Now we apply the same torque, say, the same force at the same distance from COM. Do you think its gonna have the same effect on both bodies? Bullet allows a rotation axis to go only through COM. There are some motors for constraints, but it is a kinematic thing, not dynamic. | |
| Jul 7, 2014 at 2:05 | history | answered | Ben♦ | CC BY-SA 3.0 |