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Re: Something seems wrong...
Posted by Tom Wible.   [PICTURE: SAME | NEW | HELP]
Coach on team #131, chaos, from central high school manchester and osram-sylvania.
Posted on 2/3/2000 6:24 PM MST
In Reply to: Something seems wrong... posted by Joe Johnson on 2/3/2000 6:03 PM MST:
Last year we used two window track drives to elevate our robot. We did an experiment to see how much lifting power one of the window set ups had. We put the set up in a vise and tied weights to the plastic track. The motor was able to lift about 30 pounds of steel plate. If we added weight, it bogged. From that we gave our lifting mechanism a 2-1 leverage using the track drives, this was able to raise our robot up about 7 inches in 2-3 seconds. If you have any footage of the Nationals, you can see our chassis elevation system at work in the finals when we went up against team 88. After tearing into one of the window motors after last, year we found that the brushes do not make good contact with the commutator. This may account for the power output not being optimal. The brushes really need to be seated properly to get good current transfer to the armature. Of course it is not recommended that teams open up these motors.
The seat and window motors are two of the motors in the kit which have symetrical brush assemblies. Therefore they run equally well forward and reverse. This of course means that they are not optimized for forward operation and thier output suffers. The output from the reductions will be different in either direction, due to the performance characteristics of the worm drives. (I think!)
Tom Wible
Team #131
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