. Graphical and mechanical computation. ounds; if we choose W2 = , the equation of the/t-scale will be 3 = ft and its length will be 10 in. If we choosethe fixed point or center of projection, F, on the y-axis so that I = in.,then the equations of our scales are X = L, y = ft, x^ ~ {D - )2. Art. 33 TENSION ON BOLTS WITH STANDARD THREADS 67 ^ XOOOO/L If D varies from \ in. to 4 in., we compute the corresponding valuesof x and lay off the scale on the x-axis. We then project this scale fromthe point F to theoblique axis, mark-i n g correspondi
. Graphical and mechanical computation. ounds; if we choose W2 = , the equation of the/t-scale will be 3 = ft and its length will be 10 in. If we choosethe fixed point or center of projection, F, on the y-axis so that I = in.,then the equations of our scales are X = L, y = ft, x^ ~ {D - )2. Art. 33 TENSION ON BOLTS WITH STANDARD THREADS 67 ^ XOOOO/L If D varies from \ in. to 4 in., we compute the corresponding valuesof x and lay off the scale on the x-axis. We then project this scale fromthe point F to theoblique axis, mark-i n g correspondingpoints with the samevalue of P (Fig. 33a). The final chart,showing neither thepoint F nor the pro-jecting lines, is givenin Fig. 336. On oneside of the obliqueaxis the threads per inch corresponding to the various diameters have beengiven. The index line indicates that when L = 20,000 pounds and jt =37,000 pounds per sq. in., then D = i in. and there are 8 threads to the inch. Similar charts can be built up for various other y fr Fig. 330. 30000- 40000-. SQOOO ^ HXUXXr^
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