The book The Elements of Machine Design was written by author William Cawthorne Unwin Here you can read free online of The Elements of Machine Design book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Elements of Machine Design a good or bad book?
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The arcs of contact during ap- proach and recess are found by laying off ^j /, and/ a^, on the base circles, and finding the corresponding pitch circle arcs. If the arc of action is too large the teeth may be shortened. 205. Approximate method of describing the involute. — The involute is not difficult to describe, but the following method gives a very accurate circular approximation. Let e\ e^ (fig. 221) be the working height of the teeth, or the distance between circles Ci b^, in fig. 219, me...asured along the line of centres. Take ^1 ^ = §^1 e^. Draw a tangent ^^ to the base circle. Take hk-=^\hg. Then, a circle m «, struck Digitized by Google 31 8 Maclune Design from k with radius kg^ will be the required approximation to the involute. It will coincide with the involute at n and gy and will have the same normal at g. The part of the tooth Fig, 22 X below the base circle may be radial. This part does not come in contact with a tooth of the other wheel. 2o6. To determine the length of involute teeth for given arcs of approach and recess.
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