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Loose Helicoil

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01 / Original postLoose HelicoilPaco · 2 Apr 2004 02 / This pagePosts 1–11Page 1 of 1 · chronological order 03 / Latest replyPost #11Brian . Slater · 2 Apr 2004

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rec.sport.unicycling archive
Published
2 April 2004
Last activity
2 April 2004
Original author
Paco
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11
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Public discussion
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Cranksets

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  1. Original post
    Paco
    Archived post
    #1

    I've got a problem. My MUni has converted Shimano Deore LX
    cranks, which means that my left crank is a retapped right
    crank. For those who don't know what that means, it means
    that the threads that connect the pedal to the crank arm
    have been replaced with something called a helicoil, which
    means that a righthand crank arm has been rethreaded to fit
    a lefthand pedal. My problem is that when I tighten the
    pedal enough to not come loose, it starts to loosen the
    helicoil. So when I try to tighten the helicoil, it makes
    the pedal come loose. Is the loosening helicoil something I
    can fix with loctite, or do I have to take some more drastic
    measure (like replacing the crank arms)? I'd prefer the
    cheap but effective solutions, so going out and buying a
    profile wheelset will not work.

    --
    paco - Proud owner of 2 opposable thumbs

    They would probably see me as a terrorist, weilding a Unicycle of mass
    destruction.
    -Rowan
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  2. Uni . In . Nj
    Archived post
    #2

    I am not familiar with the cranks your talking about but I am familiar
    with helicoils. If you ever want to get the helicoil out (I dont know
    why but if you do) use BLUE LOC-TITE if you want it to stay for the life
    of the unicycle use RED LOC-TITE and if you never want to worry about it
    until we're all dead and gone use GREEN LOC-TITE 😄

    --
    uni.in.nj
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  3. Cjd
    Archived post
    #3

    When I saw the thread title I thought jeez, another
    unicyclist getting knee surgery.

    --
    cjd - Pashley apologist
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  4. Theobieone3226
    Archived post
    #4

    I would just use some loctite 262 (red). You can get it at a
    hardware store usually or from unicycle.com in .5mL bottles.
    I have some in Philly if you live nearby.

    --
    TheObieOne3226 - Extreme Halfb*ker

    I won!!! I won!!! $535??? I'm broke for the rest of my life.

    -Me
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  5. Cyberbellum
    Archived post
    #5
    cjd said:

    *When I saw the thread title I thought jeez, another
    unicyclist getting knee surgery. *

    Wrong part of the anatomy. Helicoils are used by old folks
    to keep their hearing aids in place. 😎

    --
    cyberbellum - Level 1.0 rider!

    Optimists think the glass is half full. Pesimists think the glass is
    half empty. Engineers think the glass is too big.
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  6. Daino149
    Archived post
    #6
    cyberbellum said:

    * Wrong part of the anatomy. Helicoils are used by old
    folks to keep their hearing aids in place. 😎 *

    Do they use them when they want to put a left ear hearing
    aid in their right ear?

    --
    daino149 - How's it going, Texas?

    there ain't enough body armor in the country for me to try that. -- Ken
    on the mtbr forum in reference to MUni
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  7. Paco
    Archived post
    #7

    I tried getting the helicoil out so that I could put
    Loctite on it, but it will only come out about 1/10 of the
    way. Ironic, isn't it? I don't want to force it out just so
    I can make it so that it can't be forced out. So I might
    try putting some on the few threads that get exposed. Who
    knows? I'll keep you all updated on this very serious
    operation (actually, I probably won't. It's not that
    exciting of a story.)

    --
    paco - Proud owner of 2 opposable thumbs

    They would probably see me as a terrorist, weilding a Unicycle of mass
    destruction.
    -Rowan
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  8. S_wallis
    Archived post
    #8
    daino149 said:

    *

    Do they use them when they want to put a left ear hearing
    aid in their right ear? *


    Now THAT's funny!

    --
    S_Wallis - Riding with a limp

    "I am always doing that which I can not do,
    in order that I may learn how to do it."
    Pablo Picasso
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  9. Showard
    Archived post
    #9
    paco said:

    *I tried getting the helicoil out so that I could put
    Loctite on it, but it will only come out about 1/10 of
    the way. *

    I guess I should fess up and admitt that I'm the guy that
    modified Paco's crank. I've had a bad run lately: first
    Jagur's Ti rail adapter breaks - now Paco's crank ...

    It's not a helicoil that came loose. To get left handed
    threads in a right handed crank I wanted to do something
    that I thought would be stronger and better than a
    helicoil. I redrilled and tapped the original 9/16" right
    hand threads to 3/4" right hand fine threads. Then I made a
    steel threaded sleeve that was 3/4" fine threads on the
    outside and 9/16" left handed threads on the inside. I
    installed the sleeve with Loctite and "staked" it in place.
    To stake the sleeve I used a center punch and made four
    punch marks around the joint between the steel sleeve and
    aluminum crank. The idea was to deform the metal so the
    sleeve wouldn't ever come out. Here's a link showing the
    sleeve and staking:

    tinyurl.com2kz5r

    The problem though (now that I think of it - DUH) is that
    screwing in a left hand thread will screw OUT a right hand
    thread. Again - DUH!

    Paco - put Loctite on the threads as much as you can and
    also re-stake the sleeve by using a center punch to make
    punch marks around the sleeve and crank junction. I suppose
    you could stake the back and front too. I did just the back
    originally. If that doesn't work let me know and I'll fix up
    another crank but this time I'll make a sleeve with left
    hand threads on BOTH the inside and outside.

    Steve Howard

    --
    showard - ------
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  10. Paco
    Archived post
    #10
    showard said:

    *The problem though (now that I think of it - DUH) is that
    screwing in a left hand thread will screw OUT a right hand
    thread. Again - DUH!*

    To be fair, I have been trying to abuse this thing. It
    didn't start coming loose until I started taking it into 3
    feet of snow and trying to ride down sledding runs and going
    off jumps. I don't know if the cold had anything to do with
    it, but it has lasted pretty well so far. I'll try your
    fixes and see if it will help.

    --
    paco - Proud owner of 2 opposable thumbs

    They would probably see me as a terrorist, weilding a Unicycle of mass
    destruction.
    -Rowan
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  11. Brian . Slater
    Archived post
    #11

    There *is* something better than a hel(l)icoil, I don't
    rermember the name. It is a solid piece (not a spring like
    thing) that has four pins on it. After you screw it in you
    hit the pins with a special tool (a hammer works if used
    carefully) that pushes the pins into the threads, locking
    it in place. It's said to be as strong as original metal.
    Also, I've seen helicoils jam going in and be impossible
    to remove.

    I don't know if there are any left hand thread versions,
    though, let alone right to left hand threads.

    --
    brian.slater - Nellfurtiti, the Wonder Cat

    Brian C. Slater
    AKA: Snoopy

    Ok, I am now officially in my normal state of -advanced- confusion.
    Don't try to confuse me, it won't make any difference.

    "To not decide is to decide" - undecided
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