Drilling hardened rod

Is there any way you can remove that bell-crank arm for "processing" elsewhere?

-brino
 
I'd try diamond burrs , the type used by dentist, only other way is to abrade it away with edm or lazer..
Diamond drill ???
 
use a carbide drill bit go slow as to not chip the drill, and lots of coolant
 
^^^ I agree. I sure would try a carbide bit before I start trying to anneal an unknown piece of steel with a torch.
 
I would try a cobalt bit first. A carbide drill bit will break just looking at it (metaphor).
 
Well, I put on the smallest acetylene tip and heated the steel stud. No heat past the casting, so spring not effected. Used my drill press and drilled a size F hole. Tapped the hole with a 5/16-18 tap. Cleaned the pivot of rust and made sure it would pivot on the grade 8 bolt solid shaft. Cut the threads off so that nothing extended past the casting and ground down the thickness of the head so that it would fit under the lid swivel post. Working great and back on the engine. Thanks for all the suggestions

DSC_0673ab.jpg
 
For heating something like that I use my stick welder.
I turn it on high and stab the rod on the broken part and hold it tight.
Induction heat. Works great. I use a 1/4" rod.
 
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