Minibot Math + Physics Example Calculations - An Educational Read

[AlDee]

Originally Posted by boomergeek

3 inch wheel is way too big.
You should probably ask some questions:
1) under load, what will be the approximate RPM of the motor?
2) what is the speed necessary reach the top in under 2 seconds?
3) what is the diameter of the wheel needed to reach that speed?

Those will get you in the ballpark.
You can get more precise by:
1) trying different tests
2) using explanations of the math/physics- there may even be some spreadsheets you can use:
http://www.chiefdelphi.com/forums/sh...threadid=93782


There are several variables that need to be controlled to make a direct drive minibot work.

Thanks,

Yes, I didn't think the 3"inch wheels would be small enough for direct drive, It was just what I had on hand that I could quickly attach to the motor to see how fast it drove with the Gearhead removed. Since it was fast enough to drive the rubber tread off the 3" wheels, I was wondering what would be needed to keep traction material attached to fabricated small diameter wheels.