Quote:
Originally Posted by nuclearnerd
It looks like you have a 775 pro on the "elbow" gearbox, and maybe the shoulder too? No spring to balance the load either. If so, how are you holding position without burning out the motor? Is there a brake I can't see?
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We did some pretty extensive calculations on heat dissipation. The shoulder is designed to hold the entire weight of the arm for a couple minutes per Vex Pro's charts. We designed for somewhere around 4 volts. We also run a fan on the motor to pull heat away, though that helps with longer runs and only pushes the limit out a little ways.
We don't leave the arm up for long periods, and land it on the bellypan when we are done shooting. This helps keep it cooler.
The rest of the joints run cool and aren't a concern due to the low loads.