Machinery's Reference Series, Volumes 121-130Industrial Press, 1914 |
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acetylene acid adjustment angle Applications of Electricity Autogenous Automatic Screw Machines Bevel blank boring bracket brass broaching machine burnishing calipers carbon cast iron cent chips chuck clamping color copper Cutting Tools cylinder degrees F diameter drill electric welding electrode finished flame Forging fuel gage gas engine gasoline Gearing groove hardened HEAD TURRET heat held holder hole illustration inch jaws joint Locomotive Design lubricant Machine Tools Machinery Fig MACHINERY'S HANDBOOK magneto measuring mechanical metal method micrometer Milling Machine necessary needle valve obtained Operation of Machine ounces oxy-acetylene oxygen piece pipe piston plate plug practice pressure Principles and Applications pump punch Screw Thread shell shown in Fig side slide slot solution spindle spring Spur Gearing steel surface tank taper Taps and Dies teeth temperature thickness thread torch tube Turning Tool Turret Lathe valve vernier vernier scale vertical wire
Popular passages
Page 16 - ... it is advisable to preheat comparatively heavy, thick metals (especially if cast) before welding. This equalizes the internal strains, and very materially reduces the cost. In many instances it is much better to produce expansion before welding than to attempt to care for the contraction afterward. When a part has been preheated, it is well to place sheets of asbestos over it to protect the operator and prevent heat radiation, the surface to be welded being exposed. Where a piece of metal has...
Page 40 - The general method of electric soldering, as distinguished from soldering with an electric iron, consists of holding the pieces to be joined by clamping jaws with the ends of the work in firm contact ; a heavy current of electricity, regulated to heat the joint sufficiently to melt the solder, is next passed through the work. The solder, in the form of tape or wire, is then applied to the joint. It flows in and around all parts heated to the proper temperature, as when using a gas flame, but the...
Page 4 - ... piece. Thus, there are several classes of tests, such as Class A, for reference standards, Class B, for working standards, etc. The fee charged for this work depends, of course, upon the class and nature of the test. Metric length measures tested by the bureau are standardized at 20 degrees C., and standards in the customary units of yards, feet, and inches are made to be correct at 62 degrees F. Value of a Standard of Measurement The standard bars at Washington are the ultimate standard of reference...
Page 19 - B, in addition to the regular graduations, so that measurements within o.0oo1 inch can be taken. Micrometers of this type are read as follows: First determine the number of thousandths, as with an ordinary micrometer, and then find a line on the vernier scale that exactly coincides with one on the thimble; the number of this line represents the number of ten-thousandths to be added to the number of thousandths obtained by the regular graduations. The relation between the graduations of the vernier...
Page 24 - When great accuracy is required in the measurement of angles, or when originating tapers, disks are commonly used. The principle of the disk method of taper measurement is that if two disks of unequal diameters are placed either in contact or a certain distance apart, lines tangent to their peripheries will represent an angle or taper, the degree of which depends upon the diameters of the two disks and the distance between them. The gage shown in...
Page 9 - ... because at least two teeth are always cutting; the inclination in opposite directions neutralizes the lateral thrust. The teeth on the edges are staggered, the teeth on one side being midway between the teeth on the other edge, as shown by the dotted line. A double cut broach is shown at H.
Page 5 - ... apparently, through the straight line in the eye-glass of the microscope. In order to make these lines as definite as possible, the point was lapped to a bright surface.
Page 25 - Rule: Divide the taper in inches per foot by 24; find the angle corresponding to the quotient, in a table of tangents, and double this angle. Example: What angle a is equivalent to a taper of i Va inch per foot?
Page 9 - ... internal broaching. Broach A produces a square hole. Prior to broaching square holes, it is usually the practice to drill a round hole having a diameter d somewhat larger than the width of the square. The teeth of the broach gradually cut away the metal, each tooth doing a small part of the work. Broach B is for finishing round holes. Broaching is superior to reaming for some classes of work, because the broach will hold Fig.
Page 4 - July, 1866, and experience having shown that this value was exact within the error of observation, the United States office of standard weights and measures was, by executive order, in 1893, authorized to derive the yard from the meter by the use of this relation.