pic: Sorta WCD

[Chris is me]

Originally Posted by Hawiian Cadder

I am currious as to what ratios are in those dewalts. If i remember correctly it is something like 1-12, 1-16, 1-42. what ratio are you thinking of using for the chain, and what fps does it go?

I believe with CIMs most people remove a stage to make the transmissions run at 1:3 1:4 1:12.

[Hawiian Cadder]

Originally Posted by Chris is me

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.

[Frenchie461]

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.

[PAR_WIG1350]

Originally Posted by Frenchie461

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.

[Frenchie461]

Originally Posted by PAR_WIG1350

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