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If a bolt head snaps completely off then chances are the threads are not under torque . Old trick,take a real sharp prick punch or a little drill bit ground to a sharp point and back it out . I've done this many times at work and twice on a chipper after first drilling the head off .

Another method .I've seen the machinery repairmen at work do this .On say a 3/4" bolt they have dummied the socket head on ,they weld a 5/8" or 1/2" into the socket and back them out that way .Works sometimes,sometimes not . The actual socket head is not nearly as hard as the rest of the bolt .

First of all ,don't use a bit with an inserted carbide,I'll bet a dollar to a doughnut these will break like a toothpick . You can not burn out carbide with a torch ,it takes an arc . If you use the step drill method you won't break the bit . It might take 4 different sizes of bit to drill out a...

--more food for thought on this .It's a good idea to chase the bolt holes with a tap and also a capitol idea to use new bolts every so often . After a period of time the bolt will fatigue from use in this type of rotational impact loading .

On this broken or stuck bolt,that's a problem alright .You need a series of solid carbine bits ,sharp ones . You have to step drill it out . In the drilling process make sure the drill is pulling chips because if it is just rubbing away at it the damned metal will just get harder from the...