Finding out the hard way why we use coolant on stainless

A few months back, an older guy I respect told me to run a stainless job dry because 'that's how he always did it.' I did it his way and the insert shattered at hour 2, $85 gone in one second. He just shrugged and said 'some lessons cost money.' Has anyone else gotten advice from the old-timers that went against the manual?

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