A Thermal-Balance Method and Mechanical Investigation for Evaluating Machinability

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Abstract
The first section of this paper reports on the results of an investigation of a calorimetric process for the determination of drilling forces. Tests were run on a drill press which was provided with a dynamometer for registering torque and thrust. The calorimetric setup was mounted on the accurately calibrated dynamometer. The temperature rise of 50 cc of water which surrounded the tool and test bar during the cutting operation was determined. Horsepower was computed from the torque and thrust registered on the dynamometer and was found to agree substantially with the power determined from the temperature changes in the calorimeter due to cutting. The results of another series of tests run on a different machine using calorimetric apparatus of slightly changed design are also given. The second section of this paper gives a description of the machine used and the tests made prior to the investigation with the calorimetric apparatus. In these experiments a tubular test bar was cut by a tool mounted in a special holder in a drill press spindle. The feeding of the tool was effected by a weight. Because of chip interference during the cutting of magnesium alloys, these penetration tests were discontinued in favor of the calorimetric tests.

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