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Originally Posted by maclaren
I agree with replacing the rollers with idler sprockets it would be much more efficient. The noise is the chain lobes bumping over the rollers. Noise like that means inefficient.
I'm guessing from the picture that it's #35 chain?
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correct... for the wheels, the drive chain is #35 & yes we will be placing idler sprockets to decrease noise/improve efficiency
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What size wheels are you running they look about 4"?
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6" wheels with approx. 1" tread width
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What shifting method are you using. Two dog shifters, a ball shifter, or what? "?
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We are using a design based on The KillerBees FRC33 4-speed pneumatic shifter... there are 2 sliding geared axles between 3 fixed geared axles..
The shifting is done by 2 pnuematic cylinders....
gear ratios are:
1.00:1
1.78:1
2.78:1
4.94:1
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What speeds (FPS) are you estimating from the different gear ratios?
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Adam Heard, I think in a later post answers that question..
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I have to ask do you really need four gears? I mean you don't have a huge amount of traction so having a really torquey gear ratio could mean that you don't have enough traction to actually realize that troque and your wheels would just slip out. And how fast do you really need to go the field is only 50 something feet long so 12-15 FPS means so can get across the field pretty quick. Don't get me wrong a four speed transmission is really cool and I respect the engineering and the maching that goes into the effort.
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This off-season project was done more for "the fun and challenge" in preparation for 2008.. We developed some new machining methods.. learned what will work and what needs to be corrected in V2.0... By putting this out on CD we also get feedback from other teams who can speak from experience.. invaluble to the process...
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I would also be interested in the total weight of the system and the weight of the transmissions assembly.
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The side modules with wheels were if I remember correctly are 7ish pounds each.. the transmission assembly I don't know.. but I will find out soon and post that when we have them off for a bench break-in period..
Also some one was interested in the tensioner assemblies for the drive chain..
The axle block slides up and down in the cage and is held/drawn into tension by the overhead thumbscrews...
Hope this answers some of those questions...