Notes on elementary mechanical drawing, course 1 by Goulding H. J

Author:Goulding, H. J. [from old catalog]
Language: eng
Format: epub, pdf
Published: 1905-03-25T05:00:00+00:00

used, and from the pitch and pitch circles find the number of teeth upon each wheel; divide each pitch circle into as many equal parts as there are teeth in the wheel, beg-inning- for convenience at the pitch point. From these points of division la}^ off each tooth, taking- notice that the tooth of one wheel must come opposite the space of the other. From the table of proportions determine the addendum and dedendum, and strike in the point and root circles. Assume the rolling-circles that are to be used. Construct the curves for faces and flanks of the teeth. Place a sheet of transparent celluloid over the drawing-, and stick a fine needle throug-h it into the center of the pitch circle. With a needle point trace upon this sheet the tooth curve on the wheel to whose center it is fastened, extending- this curve some distance be3^ond the point and root circles. Remove the celluloid and with a keen knife cut out the curve, thus making- a templet. Pin it ag-ain to the center of the pitch circle, and with the templet strike in the face curve on one side of each tooth of the wheel. Turn the templet over, and in the same manner strike in the other face of each tooth. Each wheel is constructed in the same manner. In cutting- the templet care should be taken that the edg-es are left smooth and that it exactl}" fits the curve from which it is taken. An error commonh^ made by beg-inners is at the point where the curve crosses the pitch circle. At this point both portions of the curve come tang-ent to the radius; this is an import-

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