VARIABLE VOLUME COOLING SYSTEM DESCRIPTION OF THE INVENTION: This invention belongs in general to systems that supply liquid coolers to the interface defined by a tool and a work piece that is to be reduced in size and curvature desired. More particularly, this invention relates to a system that supplies varying volumes of coolant, at different times, in the operating cycle of the tool. Systems for supplying liquid coolers, such as water, oil or combinations thereof, to rotating tools, such as sharpening wheels, are known. Such systems usually supply the liquid coolant, through a nozzle located in the vicinity of the sharpening wheel. A pump removes the liquid container cooler and puts it at a certain pressure before discharge through a properly placed nozzle. The liquid cooling has many functions, for example, the cooler can cool the work piece and lubricate the tool, vice versa, and the cooler can drag by removing waste formed between the tool and the work piece. The liquid cooler discharged, however, is usually constant in volume, and does not take into account different conditions that occur during the cycle of the operation. To illustrate the above, the US patent 2, 140, 838, granted to Hart, presents a system for supplying coolant which supplies a cooling liquid, such as water, to a cutting tool, such as a mandrel 16, 22, for cooling and lubricating, and removing the chip from the tool. The cooler supply system includes two tubes 24, 26 which are connected to the pumps 28, 30; the two tubes are joined in the vicinity of the working face of the mandrel as shown in Fig. 2, a relatively large amount of coolant fluid is supplied, under a relatively low pressure, through the tube 24 to prevent overheating of the mandril. Simultaneously, a relatively fine stream of high speed coolant fluid is directed through the tube 26 to forcefully separate the chips, and away from the face of the mandrel. Another example of known tool cooler systems such as cutting tools is presented in U.S. Patents 5, 228, 369, Itoh, and asoc. which presents an assembly for machining a substrate surface of a photoreceptor 1, such as a drum for photocopier, laser printer, or the like. The assembly supplies cutting lubricant from a container 5 to the cutting tool 3 for assembly. The machining method requires the measurement of the temperature of the cutting tool by a sensor 4, such as a thermocouple, and the control of both the temperature and the flow rate, by the temperature control unit 6 and the unit of flow control 7. The control unit 6 responds to the temperature of the cutting tool and suppresses a temperature fluctuation of the cutting tool, as suggested in FIG. 6. Another known cooler supply system is presented in US Patent 2,434,679 to Wagner, which presents a system that supplies a liquid at low pressure on the line of pipe 3 to the nozzle 12, while simultaneously supplying liquid of high pressure on the pipe 25 to the nozzles or nozzles 19, 20, 21. The high pressure nozzles are located inside the low pressure nozzle 12, as shown in Figure 5, and the nozzles discharge two coolant liquids, at the same time, want the common outlet at the lower end of the nozzle 12. Two separate liquids, such as water and oil, are used to cool and lubricate. Liquids are immiscible and kept separate, by using separate recirculation circuits. In contrast to fixed volume systems, used to supply coolant to the interface between a machine tool, such as a grinding or polishing wheel, and a workpiece such as a camshaft, crankshaft, or the like, the present invention presents a method for supplying different volumes of liquid cooler, at different times in the machining cycle. The new method relates the volume of liquid to be supplied with the amount of metal that remains and that has to be removed, or the rate at which that metal is removed, before the machining operation is completed. By reducing the volume of liquid cooler discharged when the machining operation approaches its conclusion, the present invention allows the polishing wheel to make contact without play with the workpiece to obtain narrower tolerances and a more accurate geometry. The system for implementing the present invention is based on two, or more, controlled volume paths for supplying liquid cooling from a common supply such as a container, or a feed line to a nozzle. The nozzle deliberates large cooler volumes during high material removal points in the machining cycle, while the other path supplies low cooler volumes when material removal is low and the final geometry is being created. The low coolant volume reduces the forces imposed on the work piece by pressing the cooler against the machining tool, - such as a sharpening wheel. The cooler trapped in the V-shaped notch defined between the workpiece and the machine tool transmits forces to the workpiece that disturb an exact machining thereof. The extraordinarily limited tolerances required by automobile manufacturers ignite the need to investigate any potential path to improve tolerances, even in millionths of an inch other advantages that are attributable to the conceptually visible system I of the present invention, of providing variable volumes Is of Lined chillers, at different times in the machining cycle, will be made evident to the technician by the attached drawings, when compared in harmony with the following description. DESCRIPTION OF THE INVENTION Figure i is a schematic view of a machining system that includes a sharpening or polishing wheel, a carriage for advancing the polishing wheel and bringing it into contact with a workpiece, and a nozzle for unloading cooler on the work piece and the polishing wheel; Figure 2 is a schematic enlarged scale view of a control system, including two valves, for regulating the flow of coolant to the nozzle during discharge of a high volume; Figure 3 is a similar view of the control system but showing the two valves in different conditions, during discharge of a low volume. Figure 1 presents a schematic representation of a machine tool, such as a polishing machine, indicated generally by the figure 10. The machine 10 comprises a heavy metal base 12, which is placed in position on the floor of a workshop. A front wall 13 extends upwardly from the base 12, and a first slider 14 is located in the upper part of the wall 13. A second sill 15 rests on a plate 14, and a carriage 18 is transversely movable I with respect to the slides 14, 16. The carriage includes a head, a tool holder, on the fixed head, a tailstock or moving head, and a second tool holder on the moving head, and a shaft or driving mandrel to drive the fixed head and the head mobile, but such components are omitted in Figure 1. The opposite ends of the shaft 20 of the workpiece are inserted into, and held by the tool holders, so that the eccentric surfaces 22 of the workpiece are retained in a Fixed position during machining operations. The machine 10 also includes a drive motor
24, and a driving mechanism of the guide screw shaft 26 for advancing the wheel carriage 28, along the pad 30. The axis 32 of the polishing wheel 34, which may be made of CBN or other material similar abrasive, is fixed to the carriage 28. The motor 24, when activated, advances or backs the wheel carriage 28, in the longitudinal direction so that the wheel can polish the eccentric surfaces 22 of the work piece to the desired size and shape. The motor 36 by means of the endless belt 38, sends the motive power to the wheel 34, for a high-speed, precise polishing, after the carriage 28 has been advanced to its proper position. The nozzle 40 is positioned above the contact point for the polishing wheel and the workpiece. The nozzle sends coolant liquid, usually a water or oil-based fluid, to the polishing wheel and to the work piece, in order to cool them, and wash away the waste commonly known as chips or filings. Figures 2 and 3 show in a schematic manner, the flow control system 42 for sending a variable volume of cooler to the nozzle 40 for discharge. The flow control system includes a container 44, or other common pressure source connected to the conduits 46, 48 that goes to the common tube 50 that terminates in the nozzle 40. A first valve 52 is located in the conduit 46, while that a second valve 54 is located in conduit 48. Components restricting flow 1 such as a restriction device 56 on line 58 are connected in series with valve 52. Figure 2 shows valve 54 in its open condition, while the valve 52 is in its closed position. The pump 55 causes the liquid cooler to flow from the container 44 through the conduit 48, the valve 54, the restriction reservoir 56, to the common tube 50, and thence to the nozzle 40. Such a flow path, for the cooler liquid allows a discharge of high volume, during an ample period of time in the phase of withdrawal of material in the machining operation. The cooler forms a hydrodynamic wedge between the work piece 20, 22 and the polishing wheel 34. The forces that press the machine tool, such as the polishing wheel against the work piece, such as the cam or lobe 22 in the camshaft 20, they are much larger than the forces represented by the hydrodynamic wedge, so that the hydrodynamic wedge has a negligible impact on the material removal phase of the machining operation. However, when the work piece 20, 22 approaches its final size and geometry. The hydrodynamic wedge interferes with the ability of the machine to properly model the workpiece, in its final phase. To overcome the effect of the wedge to obtain the desired size and geometry, the flow control system 42 reverses the orientation of the valves 52 and 54. As shown in Figure 3, the valve 54 closes to block the flow to through conduit 48, while valve 52 is opened to allow flow through conduit 46, to common tube 50, and thence to nozzle 40. The components of the flow restriction device, such as the own device 56 on line 58 and / or 57 on conduit 46, ensure that a smaller volume of cooler will reach nozzle 40 when unloading between the workpiece and the machine tool. As the cooler volume is smaller, the impact of the hydrodynamic wedge is reduced, and the machine is allowed to
The tool makes a smooth contact or "handles" the work piece so that the final few millionths of material can be removed with unparalleled accuracy, although Figures 2 and 3 are only schematic drawings, the normal flow rate for the cooler , under the normal operating operations of a known machine tool, such as a polishing wheel, was 30 gallons (approximately 120 liters) per minute / inch In contrast, the low flow rate of the cooler was 5 gallons
(20 liters) per minute / inch. The valves 52, 54 are preferably solenoid valves, and the operation and timing of such valves is related to the operating cycle for the machine tool. The use of the two flow rates, increases the capacity of the machine tool to control the size and roundness by 20 millionths of an inch, a major improvement in a metal machining industry, highly competitive and therefore expensive. Although the flow control system 42 is capable of discharging two different volumes of cooler, through two distinct paths leading to the nozzle 40, the flow control system can be expanded, by using additional solenoid valves, or bypass valves. variable volume control, to discharge three or more different volumes of cooler. Additionally, although the variable volume chiller system is presented in cooperation with a polishing system, the chilling system can be applied to other machining systems. In addition, in practice, both valves 52, 54 are open during high volume operation, so that the total volume of cooler supplied to the nozzles 40 is the sum of both flow paths. This procedure guarantees that there is no "dry" period when the cooling system is switched to a low volume, because the low volume can be maintained throughout the machining cycle time, consequently the following claims should be considered widely and not be limited to the literal terms .