Question about coolant concentration meters

Just read a study from a machine tool magazine that said 80% of shops run their coolant too rich. I always thought more was better for tool life. Anyone else check their mix with a refractometer regularly?

3 comments

3 Comments

fisher.jessica27d ago

Yeah, I was surprised by that too when I first started checking. I use a cheap refractometer every Monday morning now. Found out I was running at like 12% when 8% was plenty for my aluminum work. What concentration are you aiming for?

jamiehayes27d ago

Thought it was all marketing until my own refractometer showed similar over-concentration.

wesleyfox27d ago

That study lines up with what I've seen. More coolant isn't always better and can actually cause issues like residue and skin irritation. A refractometer is the only way to know for sure what you're running.