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Thread: What's the best drill bit to use for broken stud?

  1. #33
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    Ive had success arc welding a nut onto a broken stud. Before welding there was no way it was coming out. But the extreme heat of arc weld broke the corrosion presumably because the steel expanded enough to make some scar for it to unscrew. Anything snapped off flush has to be drilled. Good luck, if its a stainless stud. That stuff is a nightmare to drill.
    08 R1200GSA
    76 Suzuki GT750

  2. #34
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    Quote Originally Posted by Tone 1 View Post
    you can get a left handed drill bit (not a wind up)when you drill the stud they normally unscrew the stud as they grip
    http://www.ebay.co.uk/itm/Left-Hand-...item3a907bad8a
    Broke a crash bar bolt on my K75 many years ago. The dealer drilled a hole and then used a left handed tap to get it out.

    tom

  3. #35
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    Do not use easy outs....they are the fingers of the devil...I also would not drill a small hole and then go up in 1mm increments..good chance of the drill snatching and trying to screw itself into the hole and then breaking, same with left handed drills.Also the same when you drill through the bolt, if there is a gap at the end.

    If the bolt was tight enough to snap off, the chance are it will not just unwind.

    I have drilled hundreds of snapped bolts out in the last 25 years or so, most success with carbide drills. If you can make a jig to help, so much the better.

  4. #36
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    nope

    Quote Originally Posted by JayC View Post
    Not much point in doing that. The stud is stuck fast due to corrosion, which in turn has effectively increased the stud diameter, the very reason it won't move. What's the point in applying heat when all it will do is increase the size further?

    Heat should be applied around the local area to the stud to create expansion of the female thread, not the male (stud) thread.
    thats not how it works ,,, it may not work in this case , but in general , you heat the stud ,,, it expands yes , all metals expand as they are heated ,,, but as its constrained by the surrounding metal , it actually forces its self tight against the hole ,,, then as it cools it shrinks again , but back to a size that is now smaller than it was to start with. then lube it , and have a go , when its cold ,,, also the heating action and its related expansion crushes the rust , and it frees as its cooling too ,,, or thats my understanding

  5. #37
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    Quote Originally Posted by tom2207 View Post
    thats not how it works ,,, it may not work in this case , but in general , you heat the stud ,,, it expands yes , all metals expand as they are heated ,,, but as its constrained by the surrounding metal , it actually forces its self tight against the hole ,,, then as it cools it shrinks again , but back to a size that is now smaller than it was to start with. then lube it , and have a go , when its cold ,,, also the heating action and its related expansion crushes the rust , and it frees as its cooling too ,,, or thats my understanding
    Yes, more chance of removing a stud or any other fitting when it's been heated

  6. #38
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    Isnt he stud out yet?
    Nigh on three year gap in procedings

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