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    Need help with sprocket ratio!
    #1
    Senior Member gvouvakos's Avatar
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    Hi! I really need help with my sprocket ratios. I have decided to go with the jackshaft method. the sprocket on the motor is 17tooth and on the jack shaft there is a 37 tooth sprocket! what ratio should i run from the jack shaft to my center carrier? 27-28 " tires! and i am not looking for speeds more than 65-70mph.

    also i was thinking of laser cutting the sprockets since importing from the US costs a lot. thanks
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    Re: Need help with sprocket ratio!
    #2
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    2.3:1 on second. Although I'd try to go lower ratio on 1st and high on second to lessen strain on second chain.
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    Re: Need help with sprocket ratio!
    #3
    Senior Member gvouvakos's Avatar
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    I am totally confused now! what does 2:3:1 exactly means?
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    Re: Need help with sprocket ratio!
    #4
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    The axle sprocket should be 2.3 times the small sprocket on jack shaft.

    For instance;
    engine 17T jackshaft 37T = ratio of 2.17:1
    then jackshaft 20T rear axle 46T = ratio of 2.3 to 1

    Final ratio 2.17 x 2.3 = 5:1
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    Re: Need help with sprocket ratio!
    #5
    Senior Member gvouvakos's Avatar
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    Ok! i have the dxf file for a 17 tooth sprocket and a 42 tooth sprocket. which is 2.47 : 1 ratio! very close to 2.3: 1. What do you think about laser cutting a sprocket? will the metal warp?
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    Re: Need help with sprocket ratio!
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    You could check local industrial suppliers as the sprockets will be good quality and often the teeth will be hardend, if you lazer cut a template with the same bore and the mounting holes in place you could produce your own finished sprockets.

    http://ablproducts.com/50-chain-sprocket.html
    http://www.fremontindustrialsupply.com/servlet/the-ALL/keyword/50-flat-sprocket/s/9/Categories
    Thanks Ironknot

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    Re: Need help with sprocket ratio!
    #7
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    Gvouvakos,

    I just had a 64 tooth sprocket laser cut for me. It is for a 530 chain, out of 5/16 hot roll, mild steel.
    It works fine and runs smooth. The cutter charged me $50 including material. I suspect if I had several cut at a time, I could get the price for each to less than $30.
    Time will tell how well it holds up, and if the chain will show any wear. But so far, it looks ok.

    Leo
    Last edited by leok; 11-09-2012 at 07:54 PM.
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