pressure line 40 provides the path for coolant traveling at the revised flow rate to enter and pass through cutting tool 30 high pressure coolant system 10 functions to maintain a constant coolant pressure between cutting tool 30 and a work piece 32 by continuously monitoring coolant pressure and adjusting pump speed to minimize any differential between the measured pressure and the target pressure therefore the present invention is able to maintain the target pressure without regard to variation in machining conditions as mentioned earlier given a certain volumetric flow rate many factors play a role in defining the coolant pressure at the cutting tool to work piece interface for example the shape size and location of the coolant path relative to the axis of rotation of the cutting tool affects the pressure generated fig2 4 depict only a few of the many cutting tools available having different coolant path geometries a first cutter 50 includes a coolant aperture 52 offset from an axis of rotation 54 a second cutter 56 includes a pair of coolant apertures 57 located at the end of the tool spaced apart from one another and the axis of rotation yet another cutter 58 includes a kidney shaped aperture 60 positioned offset from the cutter center as shown in fig4 the high pressure coolant system of the present invention allows a machinist to utilize any number of cutting tool geometries without sacrificing cutter life or control of coolant pressure between the cutting tool and the work piece additionally dimensional variance in the work piece prior to machining greatly affects the pressure generated at the cutting tool to work piece interface for.