Machine Tools and Their Operation ...McGraw-Hill, 1922 - Machine-shop practice |
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abrasive adjustment alundum wheel amount angle arbor bearings belt bevel gears block bore broach Brown & Sharpe bushing cast iron change gears chilled iron chuck circular pitch clamped clearance crankpin crankshaft cross-rail cylinder desired disk dividing head drill face feet per minute finishing fixture flanges gage GEAR CUTTING GEAR ON STUD GEAR ON WORM give grade grinding machine grinding wheel ground hardened high speed steel hole inch diameter inches in diameter index plate Intermediate Gear Driven lathe Lead of Spiral metal method miller milling cutter milling machine necessary Norton NUMBER OF DIVISIONS number of teeth operation piece piston pitch line plain planer pulley radius reamers removed revolutions per minute rings roll rotated roughing shaft shape shown in Fig shows side slide slot spiral head spiral mills steel surface grinder surface speed swivel taper tooth truing turned
Popular passages
Page 265 - No. 6, where work is most economically produced by using two men to run one machine, that is, having one man to operate it and a helper to drive the work on and off the arbor. All other data are based on one man to a machine. These pieces passed inspection within the limits given. The average loss from work of this class coming below the required limit or being otherwise spoiled is less than 1/4 of i per cent.
Page 253 - The modern grinding wheel, mounted in a good machine, can be used at a cutting speed of 6000 or more surface feet per minute and owing to this high speed it need not cut deeply relative to the rigidity of the work. Therefore it is able to remove metal from many forms of work more quickly than the milling cutter or the lathe tool.
Page 338 - Never mount a wheel without flanges which are properly relieved and of suitable proportions. For details of flanges and methods of mounting various types of wheels see the preceding chapter. Do not screw up the nut too tight; it should be set up only enough so that the flanges hold the wheel firmly. Keep all rests adjusted close to the wheel so that work cannot be caught. Avoid heavy pressure of the work 011 the wheel when grinding.
Page 336 - Rule. — Multiply the number of revolutions per minute of the grinding spindle by the diameter of its pulley, and divide the product by the number of revolutions per minute of the countershaft. Example. — The pulley on the wheel spindle is 8 1/2 in.
Page 97 - ... illustrations show the location on the machine of the different parts referred to in this book. They will contribute to a better understanding of the machine and also facilitate ordering repairs. Numbers in circles are on the part to which they refer, or they are directly over that part when it is concealed. 1. Clutch lever for starting and stopping machine. 2. Table feed setting lever. 3. Power quick traverse operating lever. 4. Table feed adjustable trip dogs. 5. Table feed trip plunger. 6....
Page 151 - ... of any desired form. The cutters shown have interlocking and overlapping teeth so that proper spacing may be maintained. In extensive manufacturing operation the gangs of cutters are usually kept set up on their arbor and never removed except for grinding. Gear Cutter (Involute) — (Fig.
Page 131 - As the index crank is turned, the spindle is rotated and the plate moves either in the same or opposite direction to that of the crank. The total movement of the crank at every indexing is, therefore, equal to its movement relative to the plate, plus the movement of the plate, when the plate revolves in the same direction as the crank, or minus the movement of the plate, Spiral Head Geared for Differential Indexing when the plate revolves in the opposite direction to the crank.
Page 263 - Nos. i to 6 illustrate what is being done under actual working conditions in commercial work on the variety of pieces indicated, which are of various materials, both soft and hard. A reversal of the usual rule, where economy is gained by having one man operate more than one machine, is shown in No.
Page 254 - Five bearings, all round within 0.00025 in.; the axis of all parallel and exactly in line; all of the right length within 0.004 in.; distance between bearings within 0.004 in. ; accumulated error not over 0.008 in. Four crank pins, all round within 0.00025 in.; the axis of all exactly parallel; all to length within 0.004 in.; all parallel with the bearings; all within 0.005 in.
Page 151 - No. 1 will cut wheels from 135 teeth to a rack. No. 2 will cut wheels from 55 teeth to 134 teeth. No. 3 will cut wheels from 35 teeth to 54 teeth. No. 4 will cut wheels from 26 teeth to 34 teeth. No. 5 will cut wheels from 21 teeth to 25 teeth. No. 6 will cut wheels from 17 teeth to 20 teeth. No. 7 will cut wheels from 14 teeth to 16 teeth. No. 8 will cut wheels from 12 teeth to 13 teeth.