pic: Team 294 2007 gearbox revision 1

[AdamHeard]

Originally Posted by AJ R

The transmissions look great. Our team is also working on something similar with the fisher price motor, and I'm wondering how well the AM planetary worked to match the speed of the fisher price with a cim. How close do the speeds of two motors have to be to use them together in a transmission?

I've heard within 90% of free speed is good.

the AM planetary has a reduction of 3.67:1 which works pretty well.... the only issue is that the FP motor tends be different every year, and have different free speeds.

this year the FP had a free speed of 15,636, which is 4260.49 after the reduction. The small CIM was at 5310... So, you can see that the FP was well out of the 90% of the small CIM (80.24% to be exact). However, it ran just fine. Even after many tough (on the drive) matches through the elims (tough as in we were playing solely defense on good, fast offensive robots [968, 330]) and the FPs never became more than warm.

Iirc, this is one of the slowest FP motors I have seen over the years, so if anything, we'll probably get a faster FP next year that would be a closer match. Or, if you're not in a hurry like we were, you could put a different size pinion on the output of the planetary to account for the difference.