We received 2 brand new CIM motors in our KOP this year (as did everyone this year) and we have 2 totes worth of graciously donated CIM motors. Some of which are used, and possibly some of which may be brand new.
We’ll almost certainly use 4 CIMs with the Toughbox Mini gearboxes on a kit chassis (2 motors per gearbox).
Is it alright to pair a brand new CIM with a (to some extent) used CIM in the same gearbox?
Besides visually inspecting the motors and seeing which ones look newer, what would be the best way to find equally performing motors? I’m thinking some kind of non-destructive torque test.
I suppose you could stick two older CIMs in the same gearbox, but turning in opposite directions to stall each other.
Whichever way the gearbox turns determines the stronger CIM.
The winning CIMs get to play with the new CIMs.
If the donated CIM motors have pinion gears installed on them, make sure they have the same tooth count and are the same diameter as what you will be using on the two new motors. I think we may have installed an old motor with a different pinion in 2019 and the robot path always curved to one side whether it was going forward or backwards. It drove the programming team crazy.
I wouldn’t worry about it. The cims are built ford tough and the design spec hasn’t really changed. I would suspect any combination of old and new motors would perform reasonably (ie within mfg tolerances) close to each other. As long as it isn’t so old that the brushes are gone (hint: it isn’t) I would still use it. Def have used newer and older cims together in gearboxes before with no appreciable issues.