Mangled crank bolt removal

[markoc]

I picked up a P7 with some nice bits.

Previous owner appears to have been somewhat heavy handed trying to remove a crank bolt. It’s completely rounded and looks to have something stuck in it



Any ideas on how to get this bugger out.

 

[Lucidone]

Don't think there's any easy answers to that one.

Either drilling (if nothing super hard already embedded) or possibly welding something in/on you can turn/get a tool on (guessing it's going to be pretty solid though!)

Spark erosion if you're feeling posh.

 

[royaloaker]

start with a 1/16" carbide drill bit and work your way larger with lots of lube on the tip.looks very doable with the right drill bits.

 

[markoc]

start with a 1/16" carbide drill bit and work your way larger with lots of lube on the tip.looks very doable with the right drill bits.

Thanks - What am I trying to achieve, drill the whole bolt out or get a purchase?

Cranks are Middleburn RS1 and the BB is a shimano so the BB can be sacrificed