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Power Engineering Volume 13

Power Engineering Volume 13


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About the Book

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. 1909 Excerpt: ... be supplemented by a constant use of stone or sand paper; on account of having to run slowly it is extremely difficult to maintain a uniform rate of revolution, and it is not easy to prevent the tool digging into the bars under this uneven speed, and frequently great damage is done a commutator in this way; the cutting edge wears rapidly, and must be replaced by another or reground during the process of truing, and in this way a "score" around the commutator is always left, which can be removed only by taking another cut off the whole of the commutator. This results in a waste of copper and so decreases the life of the commutator; moreover, as the tool wears under the stress of cutting, you produce a taper which is objectionable. Grinding Grinding is the only present alternative to the cutting tool. A little reflection on the part of anyone familiar with machine tools will show that grinding by means of 2 revolving surfaces is almost the only way of securing a perfect periphery. In the case of the commutator, the mica bars are of necessity ground to an even surface with the copper bars. There is no breaking or tearing of the mica and no dragging of the copper. The cutting wheel runs at such high speed as to make a perfectly clean cut of both mica and copper, and it is only necessary to build a cutting wheel which will not fill with copper and which will afford the required cutting efficiency. A cutting wheel has been produced by a composition in which no mineral substance appears. This wheel, unlike the common emery wheel, will grind indefinitely without gathering any copper. It is possible to true a commutator running at its normal speed which insures that it will run true in service, and it is possible to grind a commutator in about one half th...


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Product Details
  • ISBN-13: 9781232019954
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 560
  • Spine Width: 29 mm
  • Width: 189 mm
  • ISBN-10: 123201995X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 989 gr


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