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Just blew a $150 job because I didn't check my coolant mix
I was running a batch of 304 stainless parts on our old Haas and the finish was coming out awful. Turns out my coolant concentration was way too low, like 3%, and it caused galling on every single piece. Had to scrap all 20 parts and eat the material cost. What's your go-to method for keeping the mix right, or do you just trust the refractometer?
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the_phoenix6d ago
Ouch, that's a rough one. I trust the refractometer, but I also make a habit of checking it by feel. If the coolant doesn't feel slippery enough between your fingers, it's definitely time for a test.
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