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Shoutout to the old-timer in Detroit who said my coolant mix was wrecking my tools
He saw me mixing it by eye and told me to buy a refractometer, and after I did, my end mill life on 4140 steel went from maybe 10 parts to over 30 before needing a change.
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benm737mo ago
Our 6061 jobs doubled after we started checking it too.
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