Rusted bolts

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Hi
I need to drill out some rusted bolts from a cast iron housing the bolts dont go all the way through though so I'm a bit worried about doing it myself just wondering if anyone knew who was the right trade to take this problem too?
 
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Its a door of a cast iron stove the bolts go in from the back and hold the glass in place. whilst replacing the glass the bolts sheared off leaving about 5mm in the door flush with the door . If the bolts went all the way through i'd just wack a drill through them but they only go half way through into the thread thats in the cast iron. I'm not sure how to put a photo on I'll have a go in a bit.

Thanks
 
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You need to get some stud extractors. You drill a small hole on the broken sted and then screw the extractor in but it has a left hand thread so when it grips it starts to turn the stud.
To be honest if you can get the door off I would take it to my local engineering shop and slip them a tenner.
 
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Sykes Pickavant do a set of splined extractors that work very well......a hole is drilled into the sheared stud, and a hardened spline tapped in. A hexagon that fits on the spline is then used to extract the stud.
These worked perfectly for me when the hexagon of a tapered spark plug snapped off in situ...worth every penny.
John :)
 
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I had a similar problem a long time ago. Because of the limited depth of the stud I found it near impossible to get an extractor to get any purchase on offending stud. ( edit: the stud was also fairly small diameter around 5mm)

In the end I cleaned up the surface of the stud where it sheared off so I could find the centre as accurately as possible. Then I started to drill it out in progressively larger drill size until I could make out the last remaining bit in the threads themselves. I was able to pick out the coil of thread remanents leaving behind the original thread in the base material. Took a long time but got there in the end.

As I had two to do! - The second attempt was off centre on the drilling out but I still got out half the thread exposed and the other side then broke free anyway!
 
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