pic: 2 Speed Switching Module

[crazyStone]

Originally Posted by artdutra04

The first stage reduction (between the CIM motor and shifter cluster shaft) looks like it's geared faster. Don't do this in a gearbox if your intention is for the output to be slower. Gearing faster in one stage only to gear slower later is just wasted weight, space, and lowered efficiency. Instead, do like AndyMark does with a 12t pinion on the CIM motor and a 40t gear on the shifter cluster shaft.

As for the higher DP gears on the shifter output, if you could fabricate a gearbox to accurate enough tolerances to properly mesh the 20DP AndyMark shifter gears, you can easily use 25p roller chain or timing belt instead of the higher DP gears.

sorry but its posted above in this thread, that cim gear is for representation of where the connection is, and is NOT an accurate representation of the actual gearing size connecting those two shafts. Due to time constraints and hw i was unable to get that fixed yet. yes but our mentors will not approve the plan if it has roller chain. We suggested that but I guess previous bad experinces lead them to shy away from using chain. I think chain would be easier/cheaper/ and actually lighter than a 5.5" x .375" gear even with speedholing.


Yes there is a top sheetmetal piece that hold the sides apart and then bracing is brought up to support the cim perpendicular to its output as well as parallel to its output. Due to changes in the design from what I posted just a few weeks ago, theres been inadequete time to flesh the mounting specifics for the motor.

[JamesCH95]

Refusing to use roller chain is silly... It will most likely be cheaper and lighter than gears, and being pre-season this is the perfect time to learn how to use this drive mechanism that is a staple component of FRC.