Machine Tools and Their Operation ... by Fred H. Colvin Frank A. Stanley

Author:Fred H. Colvin , Frank A. Stanley
Language: eng
Format: epub
Publisher: McGraw-Hill
Published: 1922-03-25T05:00:00+00:00

No. 1 No. 2 No. 3 No. 4

Fig. 16.—Grinding cams for automobile engines.

placed in the chuck. Pieces like No. 1 were made in the automatic machine at the rate of 10 per hour. A keyway in the hole was made in the ordinary way. No. 2. These blanks were ground to rough shape, No. 3, at the rate of 10 per hour. The cams were then hardened and finished ground to No. 4 at the rate of 40 per hour. It should be clear that such a cam could not be milled to shape from the blank in nearly so short a time with the milling cutter. When manufacturing such cams in large numbers drop forgings would be used, and here again the grinding wheel is quicker than the milling cutter.

GRINDING PINS AND BEARINGS OF AUTOMOBILE CRANKSHAFTS

Another case where the grinding machine can accomplish the results desired in less time than the lathe is that of the pins and bearings of the automobile crankshaft. The results desired are as follows: Pite bearings, all round within 0.00025 inch; the axis of all parallel and exactly in line; all of the right length within 0.004 inch; distance between bearings within 0.004 inch; accumulated error not over 0.008 inch. Pour crank pins, all round within 0.00025 inch;

THE CYLINDRICAL GRINDING FIELD

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the axis of all exactly parallel; all to length within 0.004 inch; all parallel with the bearings; all within 0.005 inch of the same plane;

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