20th century machine shop practice; arithmetic, practical geometry, mensuration, applied mechanics, properties of steam, the indicator

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. 1906 Excerpt: ...10, is the pitch diameter. Having the number of the teeth and the diametral pitch, to obtain the whole diameter or size of blank of the gear, add 2 to the number of teeth, and divide by the diametral pitch. If the number of teeth is 40 and the diametral pitch is 4, add 2 to the 40, making 42, and divide by 4; the quotient, IOy2, is the whole diameter of the sear or blank. Having the number of the teeth and the diameter of the blank, to obtain the diametral pitch add 2 to the number of the teeth, and divide by the diameter of the blank. If the number of teeth is 40, and the diameter of the blank is 101/.. inches, add 2 to the number of teeth making 42, and divide by 10%. The quotient, 4, is the diametral pitch. Having the pitch diameter and the diametral pitch, to obtain the number of teeth, multiply the pitch diameter by the diametral pitch. If the diameter of the pitch circle is 10 inches, and the diametral pitch is 4. multiply 10 by 4, and the product. 40, will be the number of teeth in the gear. Having whole diameter of the blank and the diametral pitch, to obtain the number of teetli in the gear, multiply the diameter by the diametral pitch and substract 2. It' the whole diameter is 101;, and the diametral pitch is 4, multiply I0l2 by 4 and the product, 42 less 2, or 40, is the number of teeth. To obtain the thickness of a tooth at the pitch line, divide the circular pitch by 2, or divide 1.57 by the diametral pitch. If the circular pitch is 1.047 inches or the diametral pitch is 3. divide 1.047 by 2. or 1.57 by 3, and the quotient,.523 inch, is the thickness of the tooth. To obtain the whole depth of a tooth, divide 2.157 by the diametral pitch It the diametral pitch of a gear is 6, the whole depth is 2.157 divided by t. equals.35(15. The whole depth o...