[Oblarg]

Originally Posted by SeanFitz

Using the calculator from earlier in the thread, the gearbox I'm currently thinking of buying is going to have a top speed of 4.8FPS, so I guess that works out fine for me.

The only thing that worries me is that the calculator says the maximum current draw at maximum is 155 amps. Inj your opinion, is this number realistic or is it underestimated?

Also, your FIRST (hah, pun) hand experience with a 6-CIM chassis is very helpful.

I don't know how detailed the calculator you're using is, but that sounds realistic. That's not at all a worrisome number, either - the FRC breaker can take 155 amps for essentially a whole match. During the times last year when our robot was not running into problems, we were pulling ~180 amps in pushing matches, and that was about the worst-case possible while still slipping the wheels. It was when we got near the 240-amp mark that things went south, and I only ever saw that type of current draw when the motors were stalled. You will not stall your drive motors when geared for 5FPS, barring some sort of cataclysmic failure.

Make sure that if you're going for a 4.8FPS gearbox that it's a two-speed. That's far too slow to function well as a single-speed drive.