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Re: Breaking Cable
You have to think about the when the maximum force is applied to the cable. It might not be while the robot is lifting off the ground. It might be when it is in the air, and impacted by another robot. If there are other robots next to you while lifting, you might have to carry a large amount of the weight of other robots in addition to yours. I would take the worst case of all these considerations (i'm sure there are others) and use a safety factor of two. So something 600-800 lbs would probably be safe.
Another idea: the motor can only provide so much force to the string. You might multiply the stall torque of the motor by the radius of the winching mechanism. [EDIT]stall torque divided by radius, not multiplied[/EDIT]. This is a pretty good estimate of the maximum force that CAN be applied to the cable... However, impacts can instantaneously put larger loads on the cable.
Patrick
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Systems Engineer - Kiva Systems, Woburn MA
Alumni, Former Mechanical Team Leader - Cornell University Robocup - 1999, 2000, 2002, 2003 World Champions
Founder - Team 639 - Ithaca High School / Cornell University
Alumni - Team 190 - Mass Academy / WPI
Last edited by patrickrd : 25-05-2004 at 10:58.
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