This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ... universal drive-shaft yoke, shown at B in Fig. 12, is a still more difficult proposition to grind than keyseated gears. In this case, over half the hole is completely cut away, leaving the work open on both sides. A hard-bond wheel does not work very satisfactorily, because it glazes rapidly and has a tendency to ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ... universal drive-shaft yoke, shown at B in Fig. 12, is a still more difficult proposition to grind than keyseated gears. In this case, over half the hole is completely cut away, leaving the work open on both sides. A hard-bond wheel does not work very satisfactorily, because it glazes rapidly and has a tendency to throw the grinding wheel-spindle out of line. The chief trouble met with in grinding this part was in getting the hole round; this was due to the tendency of the wheel to spring away when it struck the open portion of the work. The difficulty was finally overcome by adjusting the wheel and workspindles so that they were rigidly supported, and also supporting the work in a special fixture, and clamping it from the end. It will be noticed, in this case, that the bond of the wheel was Work: --Bevel ring drive gear, 0.15 per cent carbon open-hearth steel drop-forging, carbonized 0.030 inch deep and hardened in oil. Operation: --Grinding back face and internal diameter with a Norton (vitrified) alundum special-shaped wheel, 4 inches diameter, 24 inch straight face, 3% inches wide; speed, 5400 R.P.M.--5670 feet surface speed; work speed, 260 R.P.M.--510 feet average surface speed; amount removed from diameter and back face, 0.010 inch when soft and hard. Remarks: --In both cases hand feed is used, and owing to a peculiar fancy of the operator, the same grit and grain of wheel is used for grinding work when soft and hard; production when grinding soft is 200 in nine hours; when hard, 125 in nine hours; machine used, Heald No. 75 internal grinding machine. B Work: --Automobile rear axle drive pinion, 0.20 to 0.25 per cent carbon, 0.17 per cent vanadium steel drop-forging, heat-treated. Operation: --Grinding taper hole with a Norton (vitrified) alundum wheel;
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All Editions of Advanced Grinding Practice: A Treatise on Precision Grinding Methods and the Equipment Used in Modern Grinding Practice (Classic Reprint)
