Oil cooling refers to a process whereby heat is displaced from a 'hotter' object, into a cooler oil and is the principle behind oil cooler devices. The oil carrying the displaced heat usually passes through a cooling unit such as a radiator or less commonly a gas decompresser. The cooled oil repeats this cycle, to continuously remove heat from the object.

Oil coolers are used to reject the heat generated by the spindle bearings during high rpm operations there by increasing the life of the bearing and assisting in attaining accuracy. The Spindle Oil/Coolant is drawn from the SS sump available in the cooler and circulated through the cooling circuits of the spindle. The unit utilizes a Brazed Plate heat exchanger to transfer heat at a constant level and maintains the sump temperature uniformly. The differential temperature controller maintains the oil/coolant at a constant temperature with respect to the ambient temperature thus avoiding vast difference in temperature of the spindle and ambient to avoid water condensing on the spindle head during operations