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question
How many holes and how deep ? 50 Rockwell C is pretty damn hard .. Nothing high speed is going to hold up ..
You are going to need a milling machine and a carbide end mill. Make sure you setup a stop so that you just barely break through. If you plow through fast you will break the corners off of the mill and they don't give 3/4 carbide mills away.
EDM is another option .. good luck
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