Machine Drawing and Design for Beginners: An Introductory Work for the Use of Technical Students - Couverture rigide
Présentation de l'éditeur
Every student should be encouraged to become proficient in making neat and accurate tracings expeditiously, and up to a certain point the observing ones, whilst acquiring this useful art, will be able to become familiar with many interesting details and with the usual methods of figuring and lettering drawings; but only very exceptional workers could survive a long course of tracing, for it tends to blunt the perceptions and stifle the powers which are required to make good draughtsmen and clever designers. I ndeed, tracing has been defined as a diabolical invention for destroying draughtsmen during the process of their incubation. Now, although mechanical draughtsmen are no longer called upon to produce highly finished drawings, they are expected to be able to transfer to paper any ideas of their chiefs or their own, with quickness combined with neatness in such a way that every detail is clearly defined to scale and accurately dimensioned. It is not usual for writers to refer to such minor details as machine and lever handles, so that young draughtsmen are often left to their own resources to guide them in such matters, therefore a chapter (XIII.) dealing with them has been included. In recent years much attention has been given to roller and ball bearings, particularly in motor-car work: so the construction of these, and the principles which govern their design, are explained inC hapter XVIII. In Chapter XIX. the recent and important improvements in spur gearing are described, and although the greatly improved helical gears have made mortise wheels practically obsolete, the consideration that we shall for some years to come still be using some of the old plants led the Author to include mortise wheels in this chapter. In Chapter XXVI. will be found over one hundred questions relating to the subject, suitable for examinations or for home work pui-ppses. Th
(Typographical errors above are due to OCR software and don't occur in the book.)
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