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general screw query

ddraverddraver Posts: 25,182
edited October 2010 in MTB workshop & tech
Hi Guys

A general "engineering" query

On my road derailleur, the cable stop screw does not screw into the metal of the derailleur but into a seperate "spring like" coil of metal which it would appear has been pushed into a smooth hole in odrer to provide a thread for the allen bolt.

What is the advantage of this over just putting the thread straight into the metal of the derailleur and what is it called?

I ask as the Metal coil has come loose thus nessecitating a whole new derailleur!! :evil:

Cheers
davek
We're in danger of confusing passion with incompetence
- @ddraver

Posts

  • nicklousenicklouse Posts: 50,675 Lives Here
    a push fit? not a threaded insert like a helicoil?

    harder wearing surface so less likely to strip the threads.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • ddraverddraver Posts: 25,182
    edited October 2010
    ermm, this is getting toward the edge of my shocking mechanical knowledge nick - I would guess it was a helicoil - but that it has "unthreaded" itself from the derailleur....
    We're in danger of confusing passion with incompetence
    - @ddraver
  • nicklousenicklouse Posts: 50,675 Lives Here
    what mech?

    you may get away with getting some metal adhesive/bonding agent in there.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • ddraverddraver Posts: 25,182
    SRAM Force - thanks for your help, will have a looksee!
    We're in danger of confusing passion with incompetence
    - @ddraver
  • nicklousenicklouse Posts: 50,675 Lives Here
    I think we have one in bits in the shop. Will have a look tomorrow.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
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