Quote:
Originally Posted by stinglikeabee
If I'm correct, your calculations are based on the motor free speed (CIM is ~5100 rpm). Once loaded, this speed will be reduced. You should expect about 4100-4300 rpm at peak efficiency loaded. The JVN calculator uses an 81% "speed loss constant". You may want to reference this for your calculations.
Overall, not a bad start  |
That's a very good point, I hadn't considered that the motor speed spec was without any load.
Using 4100RPM instead of 5100RPM as the motor speed gives us a speed of 4.6MPH, which is probably the slowest we'd want it to go. So we'll definitely be going with the 5:1 gearbox ratio (any higher than that would make it too slow..).
I'm not really sure how to calculate how much torque the robot will need to move, so I guess we'll just assume 107 in-lbs is enough and hope for the best
Quote:
Originally Posted by JamesCH95
Have you considered retro-fitting a large-scale RC to suit your needs?
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We already started making the chassis, but that wouldn't have been a bad idea :-)
Thanks again for your help, everyone. We'll probably order the parts this weekend or early next week. I'll post a few pics once we get the robot built!