Thread: Gear Ratios
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Unread 12-05-2006, 11:26
MattB703 MattB703 is offline
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Re: Gear Ratios
Are you talking about 7.5 - 12 fps theoretical speed using the motor's free speed or are you talking 7.5 - 12 fps actual measured robot speed?

I have found that the actual robot speed tends to be about 75% of the theoretical speed using the free speed of the motor. We design our single speed robots for no more than 7 fps using 75% of the free speed. (many people will tell you to go faster than that)

The other thing to keep in mind about robot speed is control. If you do not have a very good feedback based control system it will be a challenge for you to make good use of a robot traveling at 7 or 8 fps. Often you can perform the task faster if you slow the robot down.

I personally would not use a live axle in a crab module. You can flush mount the last gear of your reduction to the side of the IFI wheel, (make sure it is concentric to the axle center) and taking the wheel out is as simple as pulling the dead axle out. Ground OD shoulder bolts work really good for axles.

I hope that helps.

Matt B.