Can anyone fill in the blanks as to how you mount a CIM onto the AM FP Planetary gearbox? After you bore our the sun gear how do you prevent the CIM shaft from slipping? Thanks.
Are you trying to put a CIM on an AM-0002?? That item supposed to make an FP emulate a CIM. There are other planetary gearboxes intended specifically for CIM’s.
Regardless, I believe that you would need to broach a .125 keyway in the enlarged bore of the sun gear (if there is room) to keep it from slipping on the CIM output shaft.
Isn’t that a 2 mm keyway on an 8 mm shaft?
The AndyMark planetaries intended for CIMs are the GEM series.
we bored out the gear and pressed it onto the cim shaft (no key, pin, set screw). Haven’t had any problems yet.
There are many teams who mount CIM’s on AM Planetary’s. You do need to purchase the correct spacer and gear from AndyMark but it looks like the spacer is out of stock.
If i recall correctly, all we had to do was flip over the planetary cap, mount the cim to it, and trim down the cim shaft after the gear was on.
Can the AM planetary handle the torque output of a CIM under load? I would presume that using this setup in a drive or winch may be attractive due to weight, but I worry about the longevity of the tranmission.
You can’t broach the pinion. There’s already only like .030 of wall thickness between the root of the tooth and the bore for a press fit.
Will a press fit work?
we haven’t noticed any issues with our press fit. Your other option is edm the gear so it has a built in key or DD.
It’s doable, and not that hard of a process. This post describes what we did; you could easily do it without motor dis assembly to cut the shaft short.
Not to pick on you specifically, just an example.
I’ve seen many, many people speculate on processes they do not know and are making pretty wild guesses. Broaching a keyway in this would simply not work.
If you post a technical answer on chief, you better be sure it’s valid. People will read your post, and many will take it as fact and not know better.
There is no way to put any sort of keyway into the pinion. It does not matter how you put it in-there simply is no material with which to do it.
I’m curious if Loctite 680 would hold. I’ve played with it before, holding a gear on a shaft, and it took some rather large channel lock pliers on the gear, with the shaft in a vise, , to get it to slip on the shaft.
This is one of those cases where I put something up on the AndyMark site to make it available, and forget about it until people start asking questions. Sorry about this lack of communication.
- The CIM Sun Gear is available. The bore is sized to be a press fit onto the shaft of the CIM Motor. No fasteners are needed. Loctite will help secure this to the shaft, but it is not required.
A press fit in this situation is acceptable, as this is a high rpm, low torque location.
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We don’t have the CIM Spacer finished yet (our mills have been very busy with higher priority things). The intent of this part is to space the CIM Motor away from the AM Planetary gearbox so that the CIM Motor shaft does not have to be cut off. If you don’t mind cutting off the CIM Motor shaft, then no spacer is needed.
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The cap of the AM Planetary will need to be turned over during assembly in order to make this work. You must attach the cap to the gearbox, and then attach the CIM Motor to the cap. No alteration to the cap is needed in order to make this work.
Essentially, while using this CIM Sun Gear, the only thing you have to do to add a CIM Motor to the AM Planetary is slice off the CIM Motor shaft after the gear is pressed on.
Let me know if you have any further questions.
Sincerely,
Andy
Are you recommending that the pinion be pressed onto the motor shaft while the shaft is still in the motor? I wonder if the motor bearings are designed to withstand such an axial load without sustaining damage… especially since small machining tolerances for the press fit can result in large variations in required press force.
If the shaft is not removed from the motor, a shrink fit might be a safer approach.
~
Do NOT press the pinion onto the motor shaft unless you remove it from the motor. You will likely push the motor shaft through the back of the end plate. It is a simple task to remove the armature from the motor and have the end of the shaft supported on the arbor press.