friction drive problem

Discussion in 'Friction Drive' started by revelstone, Jun 21, 2008.

  1. revelstone

    revelstone Member

    ok here's the rub. or the lack of it. this picture shows what i've done, but the darn thing keeps slipping on the spindle inside and it goes like molasas uphill in january. it's june. it's great on the flats. had it up to 25 on the speedometer. just dogs down going up hill. and not that big of a hill. any suggestions on how to make it faster? in 17.jpg you can see i have a rubber roller from a freeze plug for your car. it is one and 1/4 inch diameter. put inside the bmx bike peg and the whole things is tightened with a 3/8-24 nut. help???
     

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  2. darwin

    darwin Well-Known Member

    In the pics the only thing I can see is a fuel tank, is the motor that small? What size is it? Maybe you need some more oomph.
     
  3. revelstone

    revelstone Member

    friction drive

    maybe this will help. i haven't given up yet. it might be too much me and not enough engine.:confused:
     

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  4. darwin

    darwin Well-Known Member

    Im not a rocket scientist but Id say some more oomph is in order.
     
  5. revelstone

    revelstone Member

    solution

    a pic is worth a thousand words. that's JB Weld with sand from my backyard mixed in. had to get under the porch to get it. any way i let the whole thing dry 24 hours after smoothing the mixture on the BMX bike peg. did 15 or 16 up hill, and 26 down hill. had to back off the throttle on that one. started scaring myself. thanks for all the help. by the way, what you think of my next project? thinking chain drive all the way.
     

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  6. kerf

    kerf Guest

    Try a smooth tread tire, gets better bite than mountain tire.
     
  7. revelstone

    revelstone Member

    smooth

    i was thinking about that. sure gonna hate taking that back wheel off. been on there forever. maybe longer. but i did find a slight cut in the sidewall today. cant let that go on forever.:smile:
     
  8. brendonv

    brendonv Member

    so u just mixed JB Weld and sand together and put that all over the spindle then let it dry to become almost sand paper? My spindle is wearing out and this seems like a good idea, i was thinking of putting a rubber tube over the spindle but this seems cheaper lol.
     
  9. revelstone

    revelstone Member

    yeah it feels like sand paper. really hard sand paper. used maybe half a tube of each of the small size seperate tubes. had them in my shed for a couple years. it's warm here in utah so as i mixed the tubes on a piece of cardboard i added about a tablespoon of sand. mix it good and apply it sort of evenly around the spindle. didn't worry to much about exactness. just sort of even so your engine dont bounce up and down. then let it dry 24 hours. i set mine on the hood of my isuzu trooper and left in the sun and overnight. rode the bike after about 30 hours of drying time and the difference was fantastic. i guess if i'm guessing its about 4:1 ratio if 4:1 = JB WELD:sand
     
  10. revelstone

    revelstone Member

    sand

    better make that 2:1
     
  11. brendonv

    brendonv Member

    Does it come off easy? So u used a whole tube of JB Weld, I havent used the stuff before but if seen it in the car shop though. Im into RC stuff and people use it all the time there, is it like a glue or a putty?
     
  12. revelstone

    revelstone Member

    to my knowledge it NEVER comes off. i used a whole two tubes cuz you mix whats in the tubes in equal amounts. i think the tubes are one or two ounces each. i mixed them both but only used about half of the mixture with the sand. speads like cold penut butter. don't wait to long once you mix it. it hardens up so you cant work with it.
     
  13. brendonv

    brendonv Member

    In that case ill go down and get some today then, it doesnt have a sand paper effect on my tire does it?
     
  14. Esteban

    Esteban Active Member

    You DO need a different tire on there. Mountain bike tires don't work very well. You can buy one of the small grinding wheels with shaft ,that fit into your drill ,at a hardware store. WEARING safety glasses, or wrapping wheel in a rag, beat the grinding wheel in small power pieces.[ Grit ] Mix this with JB weld & put a light coat over the roller. Grips much better in wet conditions, BUT use throttle gradually to avoid wearing out the tire.
     
  15. Mountainman

    Mountainman Active Member

    revelstone -- yes that JB Weld epoxy can be used for A LOT OF THINGS.. I have ran lightweight string through epoxy so as to add to worn out threads -- sand ? I will try that when the opportunity arises. Another good -- what I have found to be -- very good way to get more grip from a spindle -- take it to a small welding shop -- ask the welder to add a few -- beads around spindle -- rough beads so as to bit into tire -- as we know this will change the gearing ratio.. Happy Riding from Mountainman
     
  16. SirJakesus

    SirJakesus Guest

    Use a heat gun on the JB weld if it starts to solidify before you can finish with it. Just watch out if you heat it up too much the stuff will run like crazy.
     
  17. mbatl

    mbatl Guest

    hey i'm also using a weedeater that had a centrifugal clutch. I noticed you took yours off in one of the photos, did you just yank it off? How did you get it off? Was there a stud to screw a bolt onto for the roller once you got it off?
     
    Last edited by a moderator: Jun 27, 2008
  18. revelstone

    revelstone Member

    mine had a small screw in the end of the part of the clutch that spins freely. it's either got a six pointed star shape on the end or a flat tip screw or a hex head screw. it comes out counter clockwise. dont break or your just done. the clutch itself is screwed on. hold the fins of the fan with a rag and your hand. turn the clutch counter clockwise with water pump pliers. the pliers should be in a flat position in relation to the cluch, not perpendicular. do not grasp the flyweights. grasp the solid part of the clutch. turn counter clockwise. from there you'll see what you have. good luck.
     
  19. darwin

    darwin Well-Known Member

    Can you use a skate board wheel for a roller?
     
  20. revelstone

    revelstone Member

    according to a message from another member, yes. the center hole has to be the same size as your drive shaft. shim it out from the flywheel so the skateboard wheel is over the center of your tire. then another washer, double nutted with lock tight. should hold but i personnally never tried it. however the other member that told me about it had a picture somewhere on this forum of a skate wheel that had been on a 20 inch pink bike so long that the roller was taking on the shape of the wheel. in reverse of course.
     
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