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  1. #1
    RC Racer
    Join Date
    Jun 2012
    Posts
    206

    39p spur gears??

    OK, I am in the middle of a bandit project but have a dilemma...

    I talked to one of the guys at traxxas and he sent me an e-revo spur and pinion but the 62t 39p is too large. I looked online and found a 55t and am wondering what the size difference is as far as outside diameter so I can guesstimate something for the pinion. it will definitely take several tries and at $9 a pop, you can guess it wont take too many to figure it out or just give up!!
    1/10 Titan 775 bandit COMPLETED!!

  2. #2
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    I don't know boo about the Bandit, but a Revo spur will fit??
    If it does all I have handy is.....OD

    68 is 2.205
    &
    54 is 1.760
    Would you go flip my truck back over??

  3. #3
    RC Racer
    Join Date
    Jun 2012
    Posts
    206
    that tells me that less tooth count actually makes a pretty big difference in the 32p gears, where the 48p gears being way smaller in height it takes a large increase or decrease in tooth count to really make a difference in diameter.

    the examples you gave me are almost half an inch in difference in diameter for only 14 teeth.

    basing that information gives me this formula...

    2.205-1.760= 0.445
    =============
    68 - 54 = 14

    and using that, if I want to cut that in half, it gives me a drop of 0.2225 inches.... or 7 teeth on a spur gear.

    now I have a formula for guesstimating a spur gear and or a pinion gear..

    I think !!!!!
    1/10 Titan 775 bandit COMPLETED!!

  4. #4
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    Well hope you can make that work, or at least get you close to what you are trying to accomplish.........gl2u
    Would you go flip my truck back over??

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