pic: Team 192's 2014 Gearbox

[nathannfm]

Originally Posted by Rauhul Varma

the gearbox actually is 2 CIMs and 1 MiniCIM, with a CIM and MiniCIM sharing a belt.

Originally Posted by Joey Milia

The belts are 9mm wide, 3mm pitch Gates GT2 belts. The pulleys on this gearbox are 20T aluminum and 48T nylon filled ABS.

I am thinking about designing a gearbox that would have a CIM, a Mini CIM, and a larger pulley belted together and I had a few questions.

Are there any problems with belting the 3 together considering the ~15% difference in free speed between the CIM and the Mini CIM?

Is 20T the smallest you can get away with with this type of belt, and why was it chosen over 9mm wide, 5mm pitch HTD belts?

Did you have any problems with this gearbox over the season and did you end up needing to use the tension adjustment CIM mount holes?

Thanks.