Water based coolant is circulated by small energy efficient pumps between a central unit like this one and as many as eighteen CNC mills and lathes. The condition of the coolant can be checked and adjusted at this one location. Oil is skimmed from the surface of the large tank and pumped to through the secondary tank, made from a 55 gal. drum, where it is trapped. The oil is manually drained into a waste oil drum.

Smaller systems for 2 to 6 machines are available. These systems use the sump of one of the machines as the main, or central tank.

A self adjusting pickup connected to a Little Giant small submersible pump skims the oil laden surface layer off the reservoir of each machine and sends it back to the central unit. By removing the oil film, coolant is exposed to air which helps control bacteria.

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Pattent No. 7,887,700

This panel turns pumps off and on according to a cycle that is set up on a 24 hour timer. A PLC controls the start, stop sequences and a backflush cycle. It also monitors several fault conditions and shuts down pumps to prevent spills. A single indicator light flashes in a coded sequence to tell which condition caused the fault. An inverter type speed controller in the upper right corner drives a 3 hp. pump that supplies coolant to the machines. Constant pressure is maintained by programming the inverter to follow a pressure switch. The small submersible return pumps are switched by solid state relays mounted on the door. They are also protected by GFCI receptacles.

This booster assembly is used to return coolant longer distances or lift it higher than the limits of the small submersible pumps

There is a submersible well pump in the riser to purge air from the return line and ensure flow when needed. Some coolant flows because of siphoning effect when the pump is not running. The riser is sealed and a vent is extended to the ceiling to prevent overflow.

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