Coolant Concentration Measurement and Control for Deep Hole Drilling
I have watched more than one shop chase tool breakage for a week only to discover the coolant was running at half the recommended concentration. Coolant concentration is the kind of variable that does not announce itself. It drifts slowly, a tenth of a point at a time, until one day nothing works right anymore. Here is how I measure it, what the numbers should be, and what to do when they are wrong. ...