Benjamin, Charles Henry, 1856- [from old catalog], Hoffman, James David, 1868- [from old catalog] joint author · New York, H. Holt and company · leaf 297
from the edge of the plate. The velocityof the punch during cutting may be taken in this case as approxi-mately 1 in. per second. 144. Frame.—The material used in the frame of such amachine is either close grained cast iron or steel casting. Thegeneral shape is about as shown in Fig. 130 and the… … Fig. 131. assembly drawing as finally worked out about x x, the center lineof the frame. To plan the general shape of the frame about thepunch, begin by laying off the throat depth, G, say 8 in., alongthe line x x. Find H of the same figure by assuming some shapeof frame section and calculating the…
Machine design
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