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Old timer's advice on coolant ratios saved me $800 last month
Back in 2017 at a shop in Dayton, this guy named Pete who'd been running mills since the 70s told me to trust the refractometer over the mixing charts. I figured he was just set in his ways, but I always had way more tool wear than the numbers suggested. Last month I finally checked my sump at 6% concentration instead of the 10% the chart said, and my inserts are lasting twice as long. Anyone else got a rule of thumb from an old hand that beat the manual?
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evangarcia1mo ago
Man, I used to be the guy who followed the mixing chart like it was gospel. I'd top off my sump and dump in whatever the sheet said, then wonder why my taps kept snapping or my finish looked like garbage. Then an old machinist at a shop in my town told me the chart is just a starting point and your water hardness and what you're cutting changes everything. Started checking with a refractometer every week and bumping it up or down based on how the chips were flying and the tool life. Now I run closer to 7 or 8 percent on my aluminum jobs instead of the 10 or 12 the book wanted and my end mills last way longer. Wild how much money you save just by trusting the gauge over the paper.
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