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 You only really ever need 2 things in your tool box: A Hammer to separate things that shouldn't be together, and Duct Tape to put things together that shouldn't be apart. - Dave_222 [more] |
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#1
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Arm goes down too fast?
Hello all,
Our team is running into a problem with our arm for the robot. As of now the arm raises up slowly, which is what we want. However when we try to lower the arm, the movement is very fast, violent and erratic. For the moment we have an old bumper hooked up to the supports to stop the arm from crashing down into the vitals, but we really just need to make the arm lower more slowly. Any advice would be much appreciated. 
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#3
16-02-2011, 17:36
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Re: Arm goes down too fast?
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#4
16-02-2011, 17:37
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Re: Arm goes down too fast?
Don't give the robot any more Mountain Dew.
Blake PS: Are you actively trying to control the arm when it goes down, or is it just settling under the influence of gravity? If you are trying to actively control it, how does the arm behave when it is disconnected from the active devices? How do the active devices behave when they are diconnected from the arm? Is some individual part of the machine acting erractically, or are several parts combining in some odd non-linear way to create the behavior?
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#6
16-02-2011, 17:41
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Re: Arm goes down too fast?
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Edit: Does it matter? The window motors don't backdrive. Last edited by Brandon_L : 16-02-2011 at 17:45.
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#7
16-02-2011, 17:40
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Re: Arm goes down too fast?
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#8
16-02-2011, 17:50
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Re: Arm goes down too fast?
Add more surgical tubing -- lots more. The arm isn't neutrally balanced yet. This is one way to make it much more controllable.
It is easier to use software to limit the upward speed than the downward speed. Something about gravity... Use surgical tubing to take gravity out of the equation. -John
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#10
16-02-2011, 17:59
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Re: Arm goes down too fast?
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#11
16-02-2011, 18:44
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Re: Arm goes down too fast?
We have the same problem. Our arm currently falls really fast once it starts going downwards.
What is the best and most efficient way to attach surgical tubing to the arm? We added surgical tubing to it but the arm is still falling out of control.
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#12
16-02-2011, 19:03
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Re: Arm goes down too fast?
We have the same problem. Our arm currently falls really fast once it starts going downwards.
What is the best and most efficient way to attach surgical tubing to the arm? We added surgical tubing to it but the arm is still falling out of control.
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#13
16-02-2011, 19:04
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Re: Arm goes down too fast?
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In general, attach the surgical tubing in between a stationary point on your robot, and a torque lever which affects the rotation of your arm. The longer your torque lever, the more effective the surgical tubing will be, the less you need to use.
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#14
16-02-2011, 21:45
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Re: Arm goes down too fast?
Ok so, we no longer have the arm going down superfast but when we stop it from moving in the downward direction, its still super bouncy. Is there anything at all we can do to fix this? We bent up some of our arm parts from the bouncing..
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#15
16-02-2011, 22:05
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Re: Arm goes down too fast?
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need more details. Usually -increase gear ratio -balance -reverse powered lowering(requires some programming knowledge -increase the strength of the joints and materials used.
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