An Introduction to Metal-working (Google eBook)

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E.P. Dutton and Company, 1904 - Metal-work - 110 pages
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Page 30 - ... this time some works are tapped slightly with the poker to put the whole in vibration, and cause the solder to run through the joint to the lower surface, but generally the solder flushes, or is absorbed in the joint, and nearly disappears without the necessity for tapping the work. It is of course necessary to apply the heat as uniformly as possible, by moving the work about so as to avoid melting the object as well as the solder; the work is withdrawn from the fire as soon as the solder has...
Page 27 - SOLDERING Soldering is the joining together of two pieces of metal by the application of molten alloys, and may be broadly divided into two classes of workó'hard' soldering (or brazing) and 'soft
Page 28 - ... manipulation is important, and for the most part the edges of the metals are filed or scraped prior to their being soldered, as before observed ; in those cases in which the red-heat is employed, filing or scraping are less imperative, as any greasy or combustible matters are burned away, and the borax has the property of combining with nearly all the metallic oxides and earthy bases, thereby cleansing the edges of the metals should that proceeding have been previously omitted. The work, if...
Page 30 - ... glass ; shortly after, that is at a bright red, the solder also fuses, the indication of which is a small blue flame from the ignition of the zinc. Just at this time some works are tapped slightly with the poker to put the whole in vibration, and cause the solder to run through the joint to the lower surface, but generally the solder flushes, or is absorbed in the joint, and nearly disappears without the necessity for tapping the work. It is of course necessary to apply the heat as uniformly...
Page 57 - The accurate fixing of the work concentrically in the chuck can be tested with a piece of chalk in the same manner as has already been described in connection with the centreing of a cylindrical piece for turning.
Page 31 - In soldering metals other than those which have tinned surfaces, such as brass, the edges must be separately tinned before being united with the solder. The proper heating of the...
Page 27 - F., and, whilst suitable for nearly all metals, are most commonly used for ' tinned' metals, and on articles which will not afterwards be subjected to great heat.
Page 63 - ... the length of the notch being equal to the diameter of the finished work, and its depth a little more than half of this.
Page 66 - Also oil, or soap and water, should be used as a lubricant between the tool and the work.
Page 90 - In arranging the change-wheels, a very small one is used on the mandrel and a very large one on the leading screw, so that the revolution of the leading screw...

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