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Unread 12-01-2007, 17:01
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Joe Johnson Joe Johnson is offline
Engineer at Medrobotics
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FRC #0088 (TJ2)
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Re: Dual CIMs gear box adapter

Quote:
Originally Posted by free_rider_151 View Post
On the Bane Bots website they sell an adapter to put 2 CIMs on 1 12:1 gear box. Does anyone know how effiecient this setup is? Can the gear box handle it?
~Olav Oksnevad
The set up adds one extra gear pair to the gearbox so the efficiency is going to drop some but they are simple spur gears so I would estimate 95% as efficient as using the single motor set up.

As to how efficient the entire gearbox is, that is a bit trickier.

I typically use 85% per stage for planetary gear boxes* That would mean that the banebot 56mm gearbox would be about 72% efficient. The dual motor gearbox would be about 69% efficient, a difference not even worth worrying about (IMHO).

Joe J.


*assuming the ratio is low enough -- at ratios much higher than 6:1 per stage, the efficiency drops like a rock, at 10 to 1 the efficiency is often in the 30-40% range -- for just one stage. YIKES! That is why if you want 100:1 ratio in a planetary gearbox it is better to do 4:1 + 5:1 + 5:1 rather than 10:1 + 10:1 One has an efficiency of over 60% while the other has an efficiency below 15%
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Last edited by Joe Johnson : 12-01-2007 at 17:03.