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vismay_89
09-08-2008, 11:21 PM
i am planning to lift a particular ball by means of a pulley mechanism.the pulley takes care of lifting the gripper. now how do i keep the pulley in
the lifted position??
because as soon as i switch off the motor, the gravity will bring back the
pulley down. could u suggest a feasible mechanism.[b]

albertjames
09-09-2008, 07:45 PM
A pulley reverses the direction of a force, using a balance of weights connected by a rope or string. The longer the length of rope or string, the heavier the object that can be lifted.
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albertjames
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anilmaddala
09-10-2008, 03:30 AM
Hi Vismay,
U didn't mention any details regarding, the weight of the ball, or till what height you are going to lift it. Please do mention them, they are important, in deciding the mechanism.

And as for the mechanism, if the ball weighs less (like table tennis ball), i would suggest, to simply go for geared DC motor having less RPM. The time to lift the ball might be a bit long, but once lifted, the it wont come down, (assuming the ball is lite) since the motor needs higher torque to rotate its axis.