THE TOOL SHED

[nomad 11]

perfect place for this question. who can tell me ? is cobalt harder than carbide ? then are drill bits just coated with these compounds or are the solid ? i'm frustrated as hell. i snapped a bolt off. been through about 25 drill bits. resharpend some. and still got nowhere. i was told i need a cobalt bit. bought a new one. didnt work any better than my old ones. so i took it back and when i got back there the guy that said thats what i need was gone already. so i got my money back and i'm still in limbo ? (*_*)

 

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[Tpmetal]

perfect place for this question. who can tell me ? is cobalt harder than carbide ? then are drill bits just coated with these compounds or are the solid ? i'm frustrated as hell. i snapped a bolt off. been through about 25 drill bits. resharpend some. and still got nowhere. i was told i need a cobalt bit. bought a new one. didnt work any better than my old ones. so i took it back and when i got back there the guy that said thats what i need was gone already. so i got my money back and i'm still in limbo ? (*_*)

I have had luck using diamond bits and a dremel with plenty of water so as not to ruin the bit. Cut a flat into it and use a flathead (sometimes with a pipe wrench or vise grips on it)to try and get it out. Sometimes all you need is an off set angled divot and a finish nail punch or center punch(something with a small sharp tip) then grab a hammer and hammer it to unscrew it out.

 

[nomad 11]

no ! this wont work its more complicated. and i'm far more pissed off now !

 

[Tpmetal]

no ! this wont work its more complicated. and i'm far more pissed off now !

show me some pics or something, I work on all sorts of crazy specialty equipment and have a bad habit of breaking bolts..... Chances are I can come up with a solution.

 

[Deep1]

For bolt extraction, you need to use left hand drill bits.
Use a punch to dimple center of bolt.
Start the hole with a small bit, 1/8 or smaller, once you have small hole you can progress using larger bits until you get hole size you want.

Here's an extractor set with cobalt bits:

https://www.amazon.com/Irwin-Indust...569790029&sprefix=left+hand+d,aps,202&sr=8-50

 

[EQ8]

Sounds like you have a hardened bolt there.
Carbide isn't a coating on a drill. It is solid.
If possible, you could try heating it up to take some of the temper away.
Otherwise maybe ask a local machine shop what to use?

 

[YooperDaddy80]

Is the drill in reverse? LoL.

Seriously though is it?

As said above, left hand drill bits are the way to go, ive never had any luck using easyouts they always snap off then youre F'd.