The Principles of Mechanism And Machinery of Transmission Comprising the Princi

Cover The Principles of Mechanism And Machinery of Transmission Comprising the Princi
The Principles of Mechanism And Machinery of Transmission Comprising the Princi
William Fairbairn
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It is usual to allow a greater amount of clear- ance in small wheels than is necessary in large ones. Yery varying proportions have been given by different millwrights, y'oth, j^th. Y'gth, and % l}i of the pitch having been used in different circum- stances, even with the best mill-work. In the scale (fig. 108, ) this has to a certain extent been taken into account ; T ' th of the pitch is allowed OX THE TEETH OF WHEELS. Fig. 108.
153 -HD pth beyond Pitch line = a > j -{-Depth within
...Pitch line = b g > -Hhickness of Tooth = c f -MVidth of Space = d f -^Working depth of Tooth = a e -Jf Mole de^th of Tooth = a b 154 MACHINERY OF TRANSMISSION".
in smaller wheels, decreasing to y 5 th in the largest; hence the lines are not absolutely straight, but are slightly curved, except that for the whole depth of the tooth, which quantity has been assumed to vary directly as the pitch.
Assuming that this scale represents with suffi cient accuracy the proportions \vhich practice shows to be best in average cases, we may construct a table for the guidance of the mill- wright.


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