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Unread 28-09-2011, 09:00
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Re: pic: Sorta WCD

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Originally Posted by Chris is me View Post
I believe with CIMs most people remove a stage to make the transmissions run at 1:3 1:4 1:12.
Ahh, that is correct, My experience is with a dewalt and fisher-price pairing.

This also makes a lot of sense because the first stage is held together largely by the plastic casing, while the deeper in stages are much more secure.
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Unread 28-09-2011, 15:53
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Re: pic: Sorta WCD

Just to clarify the ratios on the dewalts with the first stage removed are 12:1, 4:1, and 3:1. These are further reduced by a 22:32 sprocket reduction giving speeds of 5, 13, and 17fps (Thank you JVN for your design calculator). The chain is run past 2 idlers to put the sprocket on the drive motor in the right place to only use 1 chain rather than one for each wheel.
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Unread 28-09-2011, 18:47
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Re: pic: Sorta WCD

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Originally Posted by Frenchie461 View Post
The chain is run past 2 idlers to put the sprocket on the drive motor in the right place to only use 1 chain rather than one for each wheel.
Wait, one chain per side or one chain per motor and the 2 closest wheels? While the latter sounds fine, I would not advise the former due to the fact that a single failure would render the robot un-steerable. If two chains are used per side, on the other hand, there is at least some degree of redundancy.
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Unread 28-09-2011, 21:08
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Re: pic: Sorta WCD

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Originally Posted by PAR_WIG1350 View Post
Wait, one chain per side or one chain per motor and the 2 closest wheels? While the latter sounds fine, I would not advise the former due to the fact that a single failure would render the robot un-steerable. If two chains are used per side, on the other hand, there is at least some degree of redundancy.
1 chain per dewalt, which makes it 2 per side
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