What the color of the chips tell you when drilling

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The color of your chip will give you some very important information. AS A GENERAL RULE:
lets look and see why we believe the standard chip color should be gold. I am using some cutting oil but no coolant.
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When a hot chip from a fly cutter lands on your lip, you know EXACTLY how hot they are!

ericjenness
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Great Video as usual. God, I only wish I had these videos when I was coming up! All we had back then were books and theory.
Your terrific videos show and prove all things toolmaking using Don`s expert experience and teaching ability!
Keep up your great work guy`s

MrMojolinux
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Blue steel indicates a temp around 700 F. I'm not sure how accurate the test was without a thermocouple attached to the base metal. The color of steel at different temperatures is purely oxidation. There is a chart, but I forget who makes it. Tempil I think.

dalesimonds
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