Broken Allen bit

[crofter 65]

Here’s my problem I’ve broken a Allen bit and the broken part is stuck in the grub screw, any ideas how to get it out as it is a snug fit, it’s as hard as glass so won’t drill.
Thanks
Ronnie

 

[Bobthebuilder]

Should slacken and tap out with a little bit of heat

 

[crofter 65]

The trouble is half the hex bit is still in there and I can't get it out and I am looking for ideas of how to remove it, its a good fit so won't just drop out.

 

[A1an]

Can you plunge a small slitting disc on a dremmel in and use a flat screwdriver

 

[crofter 65]

Its quite a small grub screw about 4 mm and that makes it difficult to get the broken bit out, once that's done ill heat the area round the screw and get it out, keep the ideas coming guys just to get the idea of the size its the grub screw for the nut that holds the draft spring in a Massey 135.
Thanks .

 

[Nearly]

@REStracTORATION

 

[mogman]

Can you get to the back of it and give it a good whack with a hammer
my brother snapped the ball end off a Allen key in a screw and I managed to drill it out with a good old fashioned sharp bit

 

[Kevm]

Can you batter it with a pin punch to break up the bit that's stuck in there, maybe heat it cherry red and quench it to make it really hard and brittle, if that doesn't work then heat it again and then turn the heat down slowly to try and soften it then try a good drill - like a Dormer E-HSS or pure carbide.
I would think that heating and battering it will make the grubscrew loose anyway.

 

[crofter 65]

Might try and soften it with heat, at the moment it's to hard to drill, That ill teach me to use good tools

 

[bobk]

Drill the key out then whack a sharp chisel in to jam itself .

 

[Cowcalf]

weld an arc welding rod to allen key should pull out then

 

[miniconnect]

Place a washer over the top, weld it as hard as you can, if you wanted you could then try a nut on it too, might manage to get the grub screw moving if you heat it enough.

 

[Mursal]

As above, grind the casting down to leave the groub proud for the heavy washer.

 

[crofter 65]

Thank's guys I got the nut the allen / grub screw was holding but not the grub screw itself so the urgency is over because I now have more options.
Thanks for all the help.

 

[REStracTORATION]

Those grub screws are a pita....
You need them hot then let the cool

The fun starts when trying unscrew the spring retainer nut
That again red hot and let it cool seems to shrink it or try to split it and fit a new one

 

[tomlad]

I must of been lucky on my 65 then