drill bits.

[123hotchef]

so the bolt is still in the hole below the drill bit also?

 

[qwakers]

no, the tip of the drill bit snapped off as it broke through. however its a m6 bolt and i was center drilling with a 2mm drill. there is 5-10mm of empty hole behind the broken drill bit.

and before you say punch it through into the empty space, i tried.

 

[mtt.tr]

Is there enough bolts left without drill protruding that you can get it with a stud extractor
I use these

https://www.amazon.co.uk/TengTools-TMSE05S-Set-Extractor/dp/B00AIJ0VDE/ref=asc_df_B00AIJ0VDE/?tag=googshopuk-21&linkCode=df0&hvadid=255660170781&hvpos=&hvnetw=g&hvrand=7150115473175334768&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1006555&hvtargid=pla-613176139112&psc=1&th=1&psc=1

 

[8ob]

How about a 6mm core drill and core out the bit with the broken off drill in it.

 

[123hotchef]

How about a 6mm core drill and core out the bit with the broken off drill in it.

that could work the drill and retap can u re tap to M8? once its out

 

[qwakers]

ill helicoil it once its sorted.

 

[123hotchef]

Hole cutter gets my vote then need a steady hand

 

[Kram]

Endmill will likely go off sideways or worse if used in a cordless. Drills usually snap at a pointy side angle, Id start with a burr as it will be less grabby. Shop-apt have decent and cheap ones.

Alum is the safe option, but it takes ages and needs to be kept hot to do anything. You can build up a container with a can, clamp and silicone to keep it in.

 

[RonA]

if i had a 3mm hss bit with the tip broken off deep in a hole would a carbide bit be able to drill through it?

There’s a technique on youtube where the guy puts a copper tube down the hole & then introduces mig welder down the hole, wire welds to the drill bit & combination of heat/pulling removes bit. Slightly tricky on such a small bit but might do the trick. RonA

 

[Arclikeharrypotter]

Just to clarify you have tried to drill out a snapped bolt? If so how far is the bolt below flush now?

 

[123hotchef]

There’s a technique on youtube where the guy puts a copper tube down the hole & then introduces mig welder down the hole, wire welds to the drill bit & combination of heat/pulling removes bit. Slightly tricky on such a small bit but might do the trick. RonA

Better with a stick welder at 2.5cm deep I would.say.

 

[ukracer]

There’s a technique on youtube where the guy puts a copper tube down the hole & then introduces mig welder down the hole, wire welds to the drill bit & combination of heat/pulling removes bit. Slightly tricky on such a small bit but might do the trick. RonA

Have you got a link mate?

 

[Screwdriver]

Are you feeling brave?

 

[qwakers]

Just to clarify you have tried to drill out a snapped bolt? If so how far is the bolt below flush now?

the bolt is drilled right through bar the last thousandth or so, so itll be 18-20mm below the surface.

 

[waddycall]

Anyway you could get a jig bush into the start of the hole?

 

[qwakers]

That’s my thought, something to prevent the end mill trying to wander.

 

[RonA]

Have you got a link mate?

RonA

 

[123hotchef]

You can get proper sticks with a special coating to build it up with weld they are expensive mind hit when you have limted options its worth a thought.

 

[RWD3M]

Isn't there some sort of electrolysis process you can use? I'm sure I've heard of this being used. A chap I used to work with had a small set up for his hobby of restoring vintage aircraft.

Anyone know?

 

[Kram]

Isn't there some sort of electrolysis process you can use? I'm sure I've heard of this being used. A chap I used to work with had a small set up for his hobby of restoring vintage aircraft.

Anyone know?

Ive not done it but electroysis could work at low currents. First the oxygen created at the anode will react with the aluminium and give an anodised oxide layer. This will increase the resistance which will shift the reaction to oxidise the HSS and eat it.
As with any process, test it on some scrap before the real thing.

Thats all assuming the part is suitable to rig up a wet reaction. Id guess the hole is likely the under side which may be very difficult to do.