Quote:
Originally Posted by neoshaakti
How many rpm's is manageable for an FRC robot? And also, does anyone know the speed reduction in a 2007 KOP transmission box.
Basically I'm trying to figure out whether a KOP transmission box is provides sufficient speed reduction... And sorry for the multiple questions, but is it possible to mount a wheel directly to a globe motor? ( specs)
or are globe motors more for arms and lifters?
thank you!  |
In general the KOP transmission does not provide enough reduction to directly drive your wheels without an additional chain-sprocket reduction.
However, there are sprockets provided in the kit (2007) for this purpose, which will give you enough of a reduction to drive at a reasonable speed.
You could mount a wheel directly to the globe motor, but it is not a good idea for two reasons.
Reason one: Globe motors are more for arms and mechanisms like you said, rather than drive motors. They rotate at about 90 rpm, iirc, which is very very slow for a drive system. In addition, they need to be geared down further to provide any sort of torque.
Reason two: Globe motors are notoriously bad at handling side loads. Mounting a wheel directly to the output shaft is asking for trouble, as eventually the motor will go bad.
In general, the drive motors in the KOP consist of the 2 small CIM's, the 2 large CIM's, and the 2 Fisher Price motors. You'd have much better luck using any of these.
Quote:
Originally Posted by AndyB
Depends on the wheel size. The KOP Transmissions have gear reduction of 12:1 and kind of set the standard for speed reduction. I believe on a 6" wheel with the KOP transmission (which has an output RPM of 292.5 with small CIM motor), it would give you around 7-8 FPS.
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I don't believe this is correct. Assuming it has a 12:1 reduction, it outputs ~442 rpm which works out to 11.6 ft/s with a 6" wheel.