[Oblarg]

Originally Posted by Travis Hoffman

Dumb question - are you running the top CIM in reverse relative to the lower 2? The gear in between the top-CIM pinion and the first stage output gear requires this.

We are currently only running one motor on each side at a time to prevent any accidents from running motors against each other. However, this is the single-speed, not the dual-speed, so all three CIMS are meshing to the same gear.

Originally Posted by Al Skierkiewicz

Eli,
Is it the retaining Rings or the Wave Washers? My suspicion, is that you might have pushed the pinions onto the shaft too far and they are rubbing the end of the CIM motor. This is set by the placement of the retaining washers. Also be sure to follow the instructions on mounting the CIM motors, the note on Page 2 is important. Misalignment here could also cause the effect you describe.

It's the wave washers that were missing. The retaining rings/pinions are not in contact with the CIM bodies (or at least, they weren't when we put the gearbox together, so unless someone whacked them I imagine they still aren't). Both CIMs are in the inboard position with 12-tooth pinions.

Originally Posted by magnets

The next step is to remove a CIM from the gearbox and run it like that. If you get the nasty noise, then it's a bad motor. The smell is likely what ever is in the motor heating up. Heating up grease makes quite a smell.


A few more questions
Can you turn the gearbox by hand by spinning the CIM pinion gears?
Are your CIM motors mounted in the right set of mounting holes for the pinions that you're using?

What it sounds like to me is that your center to center some gears are off. This causes a pulsing noise, excess heat, stinky gearboxes, and slow motors.

Yes, that was our planned next step, though we're not looking forward to it because removing anything from this setup is a royal pain (you have to take off the entire side plate of the AM14U to gain satisfactory access to anything).

As mentioned, the CIMs are mounted in the inboard position with 12-tooth pinions. I doubt I'm strong enough to turn the pinions by hand with the whole drive hooked up to it, but if I unscrewed the motor and rotated the motor it certainly would turn (the gearbox seemed fine when we assembled it).

Originally Posted by R.C.

Eli,

A picture (front view) or a video would def help here. Questions for you/re-confirm:

-3 CIM Single Speed Standard?
-Pinion Count?
-No Wave Washers were used? The large 1.125" ID ones?
-New CIMs?

Thanks,

I'll send a video/picture as soon as I'm able, which will be tomorrow. To review, yes, it is a 3-CIM single speed standard, pinions are 12t and CIMs in the inboard position, no wave washers were used, and the CIMs are new. FWIW, our setup doesn't feel like there's any more friction when turning the wheels than the other setup I'm working with (using the WC-style gearboxes) over at 449, and certainly no more than other drives I've done in the past.

Thanks.