A Treatise on Machine-tools

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Lippincott, 1877 - Machine-tools - 263 pages
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Page i - The undersigned, having examined the product herein described, respectfully recommends the same to the United States Centennial Commission for award, for the following reasons, viz.
Page 4 - Divide the pitch, or, which is the same thing, the side of the thread into eight equal parts, take off one part from the top and fill in one part in the bottom of the thread, then the flat top and bottom will equal one-eighth of the pitch ; the wearing surface will be three-quarters of the pitch, and the diameter of screw at bottom of the thread will be expressed by the formula : 1,299 Diameter — number of threads per inch. The accompanying tables are reprinted from Mr. Sellers...
Page 6 - The thickness of the heads for rough bolts shall be equal to one-half of the distance between their parallel sides. The thickness of the nut shall be equal to the diameter of the bolt. The thickness of the head for a finished bolt shall be equal to the thickness of the nut. The distance between the parallel sides of a bolthead and nut and the thickness of the nut shall be one-sixteenth of an inch less for finished work than for rough.
Page xiii - FRANCIS A. WALKER, Chief of the Bureau of Awards. Given by authority of the United States Centennial Commission.
Page ii - The whole of these machines are characterized by extreme refinement in every detail ; by the superior quality of the material employed in their construction ; by first-class workmanship, both in regard to nice fitting and precision, and for the mathematical accuracy of all the parts; by the beautiful outlines that are imparted to each structure ; by the correct proportions that have been worked out in the determining of strength and form ; and the disposal of material to take full share of duty.
Page 214 - If too much water is being supplied to the steam, some water may escape at this point and flow out through the overflow nozzle G ; while if there be too little water, air will be drawn in at O and carried into the boiler with the water.
Page 176 - It appears, also, from a recent work,* that the use of belts is greatly extended in American factories. In Great Britain the motion is conveyed from the first moving power to the different buildings and apartments of a factory by means of long shafts and toothed wheels, but in America by large belts, moving rapidly, of the breadth of 12 or 15 inches, according to the force they have to exert.
Page ii - ... is worthy of the highest honor that can be conferred. Besides, it is thoroughly national in its characteristics, and pre-eminently worthy of the United States and of the grand occasion of the Centennial Exhibition. Every single machine, tool, or piece of apparatus that is displayed in this vast offering would for itself command the strongest recommendation for an award, even if it stood alone as a unit. But here every unit is surrounded by thirty-three distinct machines, each one being of the...
Page xii - United States Centennial Commission has examined the report of the Judges, and accepted the following reasons, and decreed an award in conformity therewith. PHILADELPHIA, Nov.
Page 103 - It has been said that good workmen can do good work with poor tools. Skill and ingenuity may indeed accomplish great results, but the problem of the day is not only how to secure more good workmen, but how to enable such workmen as are at our command to do good work, and how to enable the many really skillful mechanics to accomplish more and better work than heretofore; in other words, the attention of engineers is constantly directed to so perfect machine tools as to utilize unskilled labor.

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