+ Reply to Thread
Page 1 of 3 123 LastLast
Results 1 to 10 of 25

Thread: Buggered bolt

  1. #1
    Join Date: Nov 2011

    Location: Wakefield west yorkshire

    Posts: 1,333
    I'm James.

    Default Buggered bolt

    Hello, a bolt on my bike luggage rack has become well and truly stuck,the Allen head recess has rounded off and the outer edge is smooth so no chance of grip, so I'll have to drill it out. I'm guessing it a stainless steel bolt but I'm not 100%, what type of drill bit do I need.? Also should I get a drill bit 1 or 2 mms smaller than the thread of the bolt? I have done this before but it was ages ago,cheers Jim
    cambridge audio azur 651w power amp, novafidelity x40 music server/pre/dac, tannoy dc4t]
    , van damme blue series interconnects, van damme studio blue 4mm speaker cable, klotz mc 5000 ,klotz silver hybrid, thanks Brian, fisual hollywood optical cable,, pioneer bdp170, akg k 550

  2. #2
    Join Date: Jun 2014

    Location: Chorley Lancs

    Posts: 1,615
    I'm Steve.

    Default

    Hi James, your thread title really piqued my interest, turns out it has nothing to do with you abusing a certain world-class Olympic sprinter.

    It's a long time since I've had to deal with this sort of thing, but I seem to remember buying a tool which you screw into the end of the bolt after drilling into the back of it first, then you clamp some mole grips onto the tool and it brings out the bolt with it. It may have been called a stud extractor, was about the size of a nail punch and it didn't cost much.
    'I'm not crazy, my mother had me tested'

  3. #3
    Join Date: Dec 2014

    Location: UK, East Midlands

    Posts: 1,161
    I'm Mike.

    Default

    Depending on the size of the head (and whether you have a steady hand) might be worth trying to hacksaw a groove across the diameter and then use a screwdriver. Have done this before with some success. My experience with drilling out bolts is that I usually swear a lot and bugger up the existing screw thread either way.

  4. #4
    Join Date: Jun 2014

    Location: Chorley Lancs

    Posts: 1,615
    I'm Steve.

    Default

    Quote Originally Posted by mikmas View Post
    Depending on the size of the head (and whether you have a steady hand) might be worth trying to hacksaw a groove across the diameter and then use a screwdriver. Have done this before with some success. My experience with drilling out bolts is that I usually swear a lot and bugger up the existing screw thread either way.
    and gripping tightly a sturdy screwdriver in the newly-made groove, and twisting it anticlockwise while hitting the top of the screwdriver can also help.
    'I'm not crazy, my mother had me tested'

  5. #5
    Join Date: Nov 2011

    Location: Wakefield west yorkshire

    Posts: 1,333
    I'm James.

    Default

    Quote Originally Posted by Pigmy Pony View Post
    Hi James, your thread title really piqued my interest, turns out it has nothing to do with you abusing a certain world-class Olympic sprinter.

    It's a long time since I've had to deal with this sort of thing, but I seem to remember buying a tool which you screw into the end of the bolt after drilling into the back of it first, then you clamp some mole grips onto the tool and it brings out the bolt with it. It may have been called a stud extractor, was about the size of a nail punch and it didn't cost much.
    Good one, I recall something like that now you've said cheers
    cambridge audio azur 651w power amp, novafidelity x40 music server/pre/dac, tannoy dc4t]
    , van damme blue series interconnects, van damme studio blue 4mm speaker cable, klotz mc 5000 ,klotz silver hybrid, thanks Brian, fisual hollywood optical cable,, pioneer bdp170, akg k 550

  6. #6
    Join Date: Nov 2011

    Location: Wakefield west yorkshire

    Posts: 1,333
    I'm James.

    Default

    Quote Originally Posted by mikmas View Post
    Depending on the size of the head (and whether you have a steady hand) might be worth trying to hacksaw a groove across the diameter and then use a screwdriver. Have done this before with some success. My experience with drilling out bolts is that I usually swear a lot and bugger up the existing screw thread either way.
    Cheers Mike, unfortunately access to the bolt makes that impossible
    cambridge audio azur 651w power amp, novafidelity x40 music server/pre/dac, tannoy dc4t]
    , van damme blue series interconnects, van damme studio blue 4mm speaker cable, klotz mc 5000 ,klotz silver hybrid, thanks Brian, fisual hollywood optical cable,, pioneer bdp170, akg k 550

  7. #7
    Join Date: Oct 2015

    Location: Pulborough, West Sussex, UK

    Posts: 978
    I'm Ian.

    Default

    I think this is the tool that Steve was talking about.

    https://www.ebay.co.uk/itm/5-Screw-E...UAAOSwCcZaLtyf
    Turntable
    Toshiba SR-370/Mission 774/Ortofon Quintet Black
    CD
    Cambridge CXC transport/Musical Fidelity X-DAC/Musical Fidelity X-10 V3 tube buffer
    Amplifier
    Nakamichi CA-5E pre-amp/Proton AA-1150 DMC power amp
    Speakers
    Mordaunt Short Signifer
    Cables
    Klotz MC5000+MS Audio/Sommer Carbokab+MS Audio/NVA LS5
    Headphones
    Sennheiser HD600/Sennheiser HD650/Koss Pro4 A

  8. #8
    Join Date: Jul 2014

    Location: Shropshire

    Posts: 2,036
    I'm Anto.

    Default

    Screw extractors are ok if you think the threads nice and loose but snap them off and its a world of hurt because then you have a hardened piece that you defo cannot drill out .
    Any chance you could mig a nut onto the existing rounded off allen head ?
    I only ride 'em, I don't know what makes 'em work

  9. #9
    Join Date: May 2012

    Location: Toulouse

    Posts: 4,429
    I'm GettingFunky.

    Default

    If buying screw extractors, get decent ones because if you have one snap, you have a bigger problem.
    If drilling stainless, I would suggest cobalt drills, use a slow drill speed and cutting lubricant.

    You can't get a set of mole grips on the head?

    Try soaking the bolt with a decent dismantling lubricant, like plus gas for a few days. Then try the mole grips.
    Another way of getting the bolt out is to hammer a torx bit into the allen bolt, but I don't like doing this. It damages the tools.
    Contemplating life, the universe and use of HiFi forums.

    Life is too short to worry about the opinion of others.

  10. #10
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 36,869
    I'm Geoff.

    Default

    Screw extractors can be useful, but can also snap off in the hole drilled for them, leaving you with an even bigger problem.

    If you can't cut a slot for a screwdriver, I'd drill it out. Mark the spot to drill as centrally as possible with a dot punch, then drill with a small drill going to successively larger sizes. Once you've drilled wide enough, the remains of the bolt thread will probably fall apart and can be cleared out leaving the female thread hopefully intact. Don't drill too big a hole or you'll take the whole thread out and have to drill larger and tap a thread in.

    I've done this loads of times. I used to rebuild cars and bikes.

+ Reply to Thread
Page 1 of 3 123 LastLast



 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •