Coolant supply and Oil Pressure Heads
The easiest supply method for coolant is through an Oil Pressure Head (OPH) so that that coolant passes over the tool and through the workpiece. The recommended coolant volume for safe chip evacuation out of the workpiece is 4 x DC (l/min), which usually gives very low coolant pressure.
Alternatively coolant can be applied through the drill tube (rotating or fixed connector for respective tools). An adapter is required to direct the coolant forwards over the tool, and a cover behind the tool to prevent coolant leaking backwards.
Note that deep hole drilling machines for Ejector drilling must be equipped with an OPH or with an extra adaptor for internal coolant supply plus a stuffing/sealing box (similar to OPH).
Honing machines can also be adapted providing the feed rate can be kept constant and at sufficient speed. Likewise lathes can be used providing they are equipped for these operations with an OPH and a coolant system.
Typical Coolant Configurations » | Recommended Coolant Volume »