. The miller, millwright and millfurnisher. unnecessary metal put in gearing is not only an extra expense, butnecessitates heavier parts throughout the entire transmission. Laying out Gear Teeth.—For the practical formation of gearwheels, any two of which having the same pitch will gear together, theauthor prefers the method described in xh^ Journal of the Fra7iklin Institutefor January, 1882. An odontograph can be based on the fact that if the teeth of a rack have LA YING OUT GEAR TEETH. 221 their face and flanks congruent, and meeting tangentially in the pitch line, allgear wheels correctly
. The miller, millwright and millfurnisher. unnecessary metal put in gearing is not only an extra expense, butnecessitates heavier parts throughout the entire transmission. Laying out Gear Teeth.—For the practical formation of gearwheels, any two of which having the same pitch will gear together, theauthor prefers the method described in xh^ Journal of the Fra7iklin Institutefor January, 1882. An odontograph can be based on the fact that if the teeth of a rack have LA YING OUT GEAR TEETH. 221 their face and flanks congruent, and meeting tangentially in the pitch line, allgear wheels correctly gearing with this rack will correctly gear with eachother. To apply this: To a bar A, Fig. 120, representing a rack, attach a zinctemplate T, of a tooth, each side consisting of two equal curves meeting inthe pitch line. Leave a space, S, between the bar and that part of the tem-plate representing the tooth. Make a portion of a disk of the same curve asthe gear wheel desired ; fasten to it a piece of zinc, /. Roll the disc B on A A aS B. Fig. 120, the bar A, and scribe the tooth T in a number of positions on the templatesheet / (Fig. 121). To prevent slip, use a watch-spring or strip of zinc, one end fastened tothe rack, the other to the wheel plate. Cut and file the second template t—which ought to reach to the centre of the plate B—and have a fine centrehole there punched. For epicycloid teeth the original template must be two cycloids, developed ,- -B
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectflourmi, bookyear1882
