. L'assistente universale, e meccanico completo : contenente oltre un milione di fatti industriali, calcoli, ricevute, processi, segreti commerciali, regole, moduli commerciali, articoli legali, ecc., in ogni occupazione, dalla famiglia alla fabbrica. 134 42.66 178 66.66 222 47 14.97 91 28.97 135 42.08 179 56.G8 223 48 15.29 92 29.30 1.36 43.29 180 57.23 224 49 15.61 93 29.61 137 43 61 181 67.62 225 60 15.93 94 29 a? 138 43.93 182 5S.93 226 per trovare il Kadius per qualsiasi passo dato diverso da due pollici, il ml«è, come due pollici è al passo dato, 6o è il radine della Tabella al r8<1ius re

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. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. 134 42.66 178 66.66 222 47 14.97 91 28.97 135 42.08 179 56.G8 223 48 15.29 92 29.30 1.36 43.29 180 57.23 224 49 15.61 93 29.61 137 43 61 181 67.62 225 60 15.93 94 29 a? 138 43.93 182 5S.93 226 To find the Kadius for any given Pitch other than two inches, the ml«is, as two inches is to the given pitch, 6o is the radins of theTable tothe r8<1ius required, or, to determine the riumher of Teeth in a wheel fora desiffnated pitch and diameter, divide the diameter ly the pitch, andoppoeite to the quotient, in the Table will be found the proper numberof teeth. Wheel Gearing, Construction of Teeth.—The cut representsa sectiou of a pair of gears whose teeth act on each other on the sameplane; they are known as spur gear. The largest is a qpxi mortiot ^46 MACHINISTS AXD EKGIXEEKS DEPABTMENT. voh^d, fitted with woodeu cogs. A shows the square wooden cog^generally driven into uiortice wheels previous to being laid off withthe dividers and dressed down to the exact pitch and outline, as shown. in the s^iaded part represenims the finished tooth. The teeth of th«small wheel (called the driven, the laree one with the cogs heins knownas the driver) are irou, being cast with the wheel, and are snfflcientlyationg if but half the size of cogs. Die pitch lint (aee dotted lines extending from 6 to C, and from D MACHINISTS AND ENGINEERS DEPARTMENT. 447 to E) is a circle of sufficient dimensions to permit the requisite num-ber of teeth and spaces to be laid out on it. The length of a tooth should be .7 of the pitch, .4 of it being belowthe pitch line, and .3 above, as shown in cut. As a general thing, thegreater the breadth of a tooth across the surface the longer it will wear. By the pitch is understood the space between the middle or cen

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• booksubje
• booksubjecttechnology