Drilling out the remains of a bolt in a cast iron stove
Posted: Thu Jul 04, 2024 8:59 am
I'm rebuilding a Morso Squirrel stove.
First problem is the snapped off bolt for the rear damper pivot. I didn't want to use heat for fear of cracking the cast iron. I know it can take the temperature but the localisation was a worry.
The pimple that is left:

Just enough thread left for a nut and guide. I made the guide ages ago on the lathe, a 3mm hole through an M6 25mm bolt.

Pilot hole, done with a hand held drill as it was too much faff to get the stove under my current small bench drill.

5mm hole, the tapping size for a standard M6 thread:

Tapped and finished:

All that's left to do now are the four bolts on the door, make some blanking plates for the boiler holes, refit the door glass, fit new seals and possibly make an adapter to fit to the existing flue.
First problem is the snapped off bolt for the rear damper pivot. I didn't want to use heat for fear of cracking the cast iron. I know it can take the temperature but the localisation was a worry.
The pimple that is left:

Just enough thread left for a nut and guide. I made the guide ages ago on the lathe, a 3mm hole through an M6 25mm bolt.

Pilot hole, done with a hand held drill as it was too much faff to get the stove under my current small bench drill.

5mm hole, the tapping size for a standard M6 thread:

Tapped and finished:

All that's left to do now are the four bolts on the door, make some blanking plates for the boiler holes, refit the door glass, fit new seals and possibly make an adapter to fit to the existing flue.
