Benjamin, Charles Henry, 1856- [from old catalog], Hoffman, James David, 1868- [from old catalog] joint author · New York, H. Holt and company · leaf 301
the height ofthe gap, k, and draw the outline of the gap. The value k is con-trolled by the space taken up by the dies, metal to be punched,and clearance. It cannot be determined exactly, but a goodestimate may be made. Assuming some section of the frameas Fig. 135 and solving for the fiber stress… … Fig. 135. For the vertical section take Fig. 136, in which case we havea; = 3.26in.7 = 4411.79Zf = 655. S2 = 791 lb. per square inch, which shows that the sectioncould be materially reduced in size if it were desired. Thereduction could very properly be made according to the dottedlines. If it were…
Machine design
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