Rear sprocket modification

Discussion in 'Frame Mounted Engines' started by rojo0550, Aug 17, 2007.

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  1. rojo0550

    rojo0550 Guest

    I recently received a DACS brand(??) rear spoke-mount sprocket that
    has the 9-hole bolt circle,and 44 teeth.I had previously purchased the
    rag-joint sprocket mounting kit from a different source;after lining the 9-hole mounting gasket with the sprocket,I was surprised?? to find that the sprocket
    mounting bolt circle didn't match the sprockets bolt-the bolt holes in the sprocket are roughly one size smaller than the mounting- pattern diameter!!!
    I was wondering if anyone else has had this problem??
    I have decided to live with this snafu by redrilling the proper sized holes-and
    correct bolt circle regarding the mount-in the sprocket,but when I tried tentatively drilling holes with a H.S.S. 5/16 inch drill bit I have nothing but problems!!!
    What is a good drill bit for drilling in high carbon steel alloys???

  2. gone_fishin

    gone_fishin Guest

    i suggest you try introducing yourself to make friends and get the help you're looking for.

    your first mistake was trying to mix & match, spend some time reading the forums to learn that hardly ever works.
  3. npk1977

    npk1977 Guest

    Rojo -

    You can buy the part you need from that's dax's website.

    I recommend you don't drill the holes yourself, because you want a concentric pattern. Because you don't know what kind of bit to use in this metal, my guess is you don't have easy access to high-quality machine tools. If I'm wrong, forgive me.

    I'd try drilling with a cobalt tipped bit. Expensive, but should work. Again, don't do this unless you're able to drill concentric holes. Remember to lube as you're drilling.

    [edit] -- Didn't really understand the question, if you're making the holes bigger, then yours is an easier problem!! Ignore what I said above + drill away :) [/edit]
    Last edited by a moderator: Aug 17, 2007
  4. rcjunkie

    rcjunkie Guest

    You should have no problem drilling out the holes to make them larger, I do it all the time. Dax's hardware is beefier than other vendors which is why you are seeing the disparity.
  5. 5-7HEAVEN

    5-7HEAVEN Guest

    :cool:the easiest fix would be to buy new grade 8 bolts that fit the existing holes.
  6. drimpact

    drimpact Member

    I do know for a fact that all sprockets and rag joints are not the same diameter.

    I inherited a box of odds and end parts and found at least two different bolt pattern diameters.

    If you bought your sprocket from dax, the sure thing is to buy a rag joint from Dax. IMHO
  7. azbill

    azbill Active Member

    duane (dax) sells heavy-duty hardware that seems to hold up better than others I have seen :cool: