American Machinist

Coolant dissolves chip problem.(Case books)

ONCE OR TWICE A MONTH, FOR A FEW HOURS OR A day, maintenance personnel at Royal Master Grinders used chisels to dislodge solidified clumps of cast iron chips clogging conveyors and workpiece pallets on a large horizontal K&T CNC milling center. The necessary chore was disruptive, time-consuming, and often interfered with the shop's 8 to 10 hr of lights-out machining. To remedy the situation, the Oakland; N.J., manufacturer of centerless grinders and associated automation systems switched to a nonsynthetic, emulsion-type coolant.

This type of fluid coats chips with a thin, oily film, which prevents clumping as well as rust and corrosion. Antioxidant agents keep the oil film from solidifying over time, and soapy emulsifying agents stabilize the fluid and facilitate rinsing. …

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