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Stellite drill bit used to drill hole in hardened O-1 tool steel plate at Rockwell C hardness of 60 - 62 Rc.
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You were a machinist all your life and you operate machines with EXTRA baggy long sleeves?
Great lesson.

FixNewsPlease
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Love your videos. I found you while looking for stirling engines and see you have been on a hiatus until now. Will you be making more videos in the near future? Looking forward to a reply.

kwhp
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prob not good for taping though since the heat probably weakens the surrounding metal but maybe ok if going slow?

sticksbass
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Combustion engines are the cause of times we are facing.

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