Synopsis
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. 1922 Excerpt: ...the height Fro. 132. Fig. 133.--Shrouding. of the tooth on one or both sides of a tooth (Fig. 133). This plan is called shrouding, the object being to strengthen the teeth. EXERCISES. VI. 1. What is the meaning of the terms pitch, breadth of face, thickness of tooth, pitch circle, pitch line, rim, arm, and boss as applied in toothed gearing? 2. A spur wheel lias teeth of 3 inches pitch. Sketch a tooth and mark on it the thickness at the pitch line, and the height above and depth below the pitch line. What names are given to these distances? 3. Show by a sketch what is meant by the clearance of wheel teeth. 4. Give sketches of a mortise open wheel showing the form of the rim and of the teeth, and the method of fixing the latter. In what circumstances would mortise wheels be used? 5. Two shafts intersect at right angles and are connected by bevel wheels with 22 and 44 teeth respectively of l" pitch. Draw the pitch surfaces of the wheels, and find the development of the conical surfaces on which the shapes of the ends of the teeth are set out. 6. Sketch in section a pair of bevel wheels in gear with one another. The centre lines of the shafts and the pitch surfaces are to be shown. 7. Two bevel wheels connecting shafts at right angles have respectively 12 and 30 teeth, the pitch being 2". The width of face is 4". Set out the pitch surfaces of the wheels. Show also the development of one tooth of the smaller wheel, the flanks being radial and the diameter of the rolling circle for the face equal to twice the pitch. B.E. 8. Draw to scale, full size, one tooth of a pinion which has 12 teeth of 2" pitch, the rolling or describing circle for the teeth being 4"3 times the diameter. 9. A spur wheel has a pitch circle 30 inches diameter with p...
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