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Re: Interpreting motor data
Thanks for that Ken, I looked it over and did learn some stuff. But Let me aska more specific question about all of this now based on what I am trying to do.
Right now in theory what my robot will have is 6 inch wheels and will be driven by 2 CIM motors running through banebots 12:1 transmissions (I know I have seen all the horror stories about them). So I figured I would start out by calculating the max weight the robot would be able to move. So from looking at the CIM motor specs it looks like stall torque is at around 340 oz-in.
I started out by figuring out the toque after the gear ratio, which is 12:1 so 340 * 12 = 4080 oz-in. then I wanted to convert the units to what is more useful to me. 4080 oz-in * (1 lb / 16 oz) * (1 wheel / 3 in radius) = 4080/48 = 85lbs per motor.
This would turn out to be 170 pounds with a 1:1 outside of the gearbox.
As for sprockets I will porbally be using a 28:12 ration (unreduced representation, 12 tooth drive, 28 tooth wheel) which will result in 170 * (28/12) = 397 pounds
Does this all sound right and make sense how I did it? (in a perfect system)
Also instead of going through and figuring out efficiency stage by stage is there a number people like to use for a overall drive system efficency?
Thanks,
-John
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