Coolant-Life

I spend more time managing coolant on my deep hole drilling machines than on any of my conventional CNC equipment. The reason is simple: deep hole drilling pushes coolant through the tool at high pressure, blasts chips out through the drill flute or annular gap, and in the process generates a massive volume of contaminated fluid that needs continuous treatment. After ten years of running BTA and gun drilling machines, I have learned that treating coolant as a disposable consumable is far more expensive than treating it as a managed resource. ...

Deep hole drilling puts more demand on coolant than any other machining process. High pressure, high flow, and continuous chip load mean coolant degrades faster. I have found that a systematic dump-clean-recharge (DCR) procedure every 6-12 months doubles coolant life and prevents most contamination problems before they start. Here is the procedure I use. When to Do a DCR I do not wait for a fixed schedule. I watch for these triggers: ...

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. ...

What I Mean by Coolant Contamination Coolant in deep hole drilling does more than cool. It flushes chips, lubricates the cut zone, and protects the machine from corrosion. When contamination sets in, every one of those jobs suffers. I have walked onto floors where operators blamed the tool, the feed rate, or the material — only to find the real culprit was degraded coolant. Here is what I look for. ...