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Drill bits - which for snapped bolts?

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stinkwheel
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Joined: 12 Jul 2004
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PostPosted: 20:46 - 09 Nov 2021    Post subject: Re: Drill bits - which for snapped bolts? Reply with quote
kramdra wrote:


@Stinky where are you buying carbide centre drills cheap enough for abuse in a cordless?


Ebay. Tenner. Shit drills but it's not like it's delicate machining.
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Fat Angry Scotsman
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Joined: 12 Jan 2021
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PostPosted: 13:30 - 10 Nov 2021    Post subject: Re: Drill bits - which for snapped bolts? Reply with quote
Pete. wrote:
Yeah? Ever seen one?


Literally drilled and tapped eight M8 x 1.00 - 6H threads yesterday so yes?

In the same piece also turned a M48 x 2.0 - 6H (left-handed) thread.
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bugeye_bob
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Joined: 05 Sep 2013
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PostPosted: 14:05 - 11 Nov 2021    Post subject: Reply with quote
Bit late to this party, But if they snap below surface so you cant get a nut on, Ive been using some door hinge drill bits,
They have a sleeve that centres the drill in the hole of the broken thread, makes drilling them out much safer imho.

Link is just an example.
https://www.manomano.co.uk/p/door-lock-hinge-drill-bit-set-self-centering-hinge-drill-bit-for-wood-plastic-26366545
https://cdn.manomano.com/images/images_products/15043011/P/26662979_2.jpg
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 14:10 - 11 Nov 2021    Post subject: Reply with quote
bugeye_bob wrote:
Bit late to this party, But if they snap below surface so you cant get a nut on, Ive been using some door hinge drill bits,
They have a sleeve that centres the drill in the hole of the broken thread, makes drilling them out much safer imho.

Link is just an example.
https://www.manomano.co.uk/p/door-lock-hinge-drill-bit-set-self-centering-hinge-drill-bit-for-wood-plastic-26366545
https://cdn.manomano.com/images/images_products/15043011/P/26662979_2.jpg


The other one you can do is make a specific drill guide. If you still have one of the studs functional, you drill two holes in a block of alloy or steel with the same hole centres as the studs. Bolt it on with the existing stud and use the other hole as a drill guide.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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Hong Kong Phooey
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Joined: 30 Apr 2016
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PostPosted: 13:33 - 22 Nov 2021    Post subject: Reply with quote
I've got snapped studs out from 5mm below the surface of the head with a mig welder. You need to keep building up the weld by blobbing more on top. Eventually you'll get enough to grab on to with mole grips. Nuts are optional.

Hand drilling stainless in situ can cause the stud to harden, as you're heating it up rather than drilling due to lack of pressure. There's also the risk of the bit wandering, as the snap is never even, and then you're shelling out for inserts.

On top of that there's the risk of having the hardened and brittle easy-out/extractors snapping off in the hole.

For those reasons I don't even bother to think about drilling any more.
Even if I had the head out and clamped tight on a pillar drill, I'd still not bother drilling as I've had a lot of success with the mig.
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Old Thread Alert!

The last post was made 2 years, 148 days ago. Instead of replying here, would creating a new thread be more useful?
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