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  1. #1
    Senior Member OldsCOOL's Avatar
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    Drilling Crank Spindles

    Have you ever hollow drilled a cro-mo spindle? Yes, I'm aware of strength issues being compromised. This is a Shimano BB (1988). My Campy spindles are hollow so I'm thinking a good machinist could do this. Has anyone tried this?
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

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    I don't think it could be done - the races are hardened and I would expect that would go far enough into the steel to make it un-machinable.

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    Quote Originally Posted by OldsCOOL View Post
    Have you ever hollow drilled a cro-mo spindle? Yes, I'm aware of strength issues being compromised. This is a Shimano BB (1988). My Campy spindles are hollow so I'm thinking a good machinist could do this. Has anyone tried this?
    What do you hope to accomplish by this? Surely, there are less stressed spots on the bike where a couple of ounces can be removed.

  4. #4
    rhm
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    multimodal commuter rhm's Avatar
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    Quote Originally Posted by Slash5 View Post
    I don't think it could be done - the races are hardened and I would expect that would go far enough into the steel to make it un-machinable.
    No, the hardness of the races is pretty thin; if you grind down and polish pitted races, you can get a beautiful finish but the races are too soft. The hardness is gone.

    But no, I've never done it, and wouldn't spend any more time considering it than I did just now. It would be an awful lot of work and the odds of success are poor.

  5. #5
    Senior Member OldsCOOL's Avatar
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    Quote Originally Posted by D1andonlyDman View Post
    What do you hope to accomplish by this? Surely, there are less stressed spots on the bike where a couple of ounces can be removed.
    Just winter musing. Besides, if Campy and Hollowtech does this, why cant I?
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

  6. #6
    Senior Member SJX426's Avatar
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    Its all about the tools and process. If you know it and a can apply it, sure you can. Strength may or may not be compromised, depending what strength is needed and if the machining impacts it. Why don't you, for winter kicks, do a FEM analysis and let us know?
    Bikes don't stand alone. They are two tired.

  7. #7
    Senior Member OldsCOOL's Avatar
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    Quote Originally Posted by SJX426 View Post
    Its all about the tools and process. If you know it and a can apply it, sure you can. Strength may or may not be compromised, depending what strength is needed and if the machining impacts it. Why don't you, for winter kicks, do a FEM analysis and let us know?
    I have a machinist locally that has a home shop. Sometime over the winter I'll get this to him and see what he can do.
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

  8. #8
    Senior Member SJX426's Avatar
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    So what is the orientation of the holes relative to the axle center line?
    Bikes don't stand alone. They are two tired.

  9. #9
    Senior Member gugie's Avatar
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    I think it's been well established that I have a hard time leaving well enough alone, but in this case, I'd leave well enough alone.

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    expect there would be more weight benefit by going with a ti spindle with pressed on steel races

  11. #11
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    Not a big deal to drill it if you have a lathe IMO. But why?

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    Quote Originally Posted by Reynolds View Post
    But why?
    Because that's where the pros stash their dope.
    The man who dies with the most toys…is dead. - Rootboy

  13. #13
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    Somewhere Laurent Fignon and Louison Bobet are shaking their heads.

  14. #14
    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by SJX426 View Post
    So what is the orientation of the holes relative to the axle center line?
    ???

  15. #15
    Senior Member OldsCOOL's Avatar
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    It is a sign of moderism, I tell ya. Come on you guys, you really cant guess why?

    My Campy spindle on the '77 Colnago is quite hollow. And y'all been using QR's?
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

  16. #16
    Senior Member SJX426's Avatar
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    Are you drilling along the center line or perpendicular to it? If along the CL then the hole would have to be smaller than the threads for the bolt or is this a different axle? I am thinking square taper.
    Bikes don't stand alone. They are two tired.

  17. #17
    Senior Member OldsCOOL's Avatar
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    Quote Originally Posted by SJX426 View Post
    Are you drilling along the center line or perpendicular to it? If along the CL then the hole would have to be smaller than the threads for the bolt or is this a different axle? I am thinking square taper.
    Most definately parallel to the line of spindle. Yes, smaller diameter than threads.
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

  18. #18
    coprolite fietsbob's Avatar
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    You have to take the Temper out First Then Re Heat Treat it when you are Done..

    I've made nice scrapers out of Metal Files. but I had to make the file soft first, so I could use Other Files to shape it.

  19. #19
    billy chuck eschlwc's Avatar
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    if you have a spindle to replace it (just in case), why not try it?

    just don't drill your stem or crank arms. B^)
    happer: keep watching the sky, macintyre.

  20. #20
    Senior Member OldsCOOL's Avatar
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    Quote Originally Posted by eschlwc View Post
    if you have a spindle to replace it (just in case), why not try it?
    There it is.
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

  21. #21
    Senior Member exmechanic89's Avatar
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    Quote Originally Posted by OldsCOOL View Post
    There it is.
    I agree, give it a shot. If the worst happens and the spindle is no longer useable, not a biggie. Post an update if you give it a try..

  22. #22
    Senior Member bertinjim's Avatar
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    OldsCool-

    Why not just buy one pre-drilled? Campy, TA and Stronglight made hollow drilled, square taper crank axles threaded at both ends for the fixing bolt.

  23. #23
    verktyg verktyg's Avatar
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    Quote Originally Posted by gaucho777 View Post
    Somewhere Laurent Fignon and Louison Bobet are shaking their heads.
    Fignon-BrokenSpindle2.jpg Fignon-BrokenSpindle1.jpg

    Nuff said...


    verktyg

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    Things aren't always what the seem... Don't believe everything you think!

    Chas.

  24. #24
    Senior Member Drillium Dude's Avatar
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    Quote Originally Posted by eschlwc View Post
    ...just don't drill your stem or crank arms...)
    Why not?





    DD

  25. #25
    Still learning oddjob2's Avatar
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    Quote Originally Posted by OldsCOOL View Post
    Just winter musing. Besides, if Campy and Hollowtech does this, why cant I?
    You need a life! Go ride more or find some snow to shovel.
    Life is like riding a bicycle. To keep your balance you must keep moving. Albert Einstein
    2016 Additions: 1981 Miyata 1000, 1981 Schwinn Voyageur 11.8 chrome, Schwinn Paramount 50th Anniversary, Dawes Galaxy, Raleigh International, 1985 Raleigh Alyeska

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