Schwarkzkopf, Ernst · New York : J. Wiley & Sons ; London : Chapman and Hall · leaf 74
ING, SHOULDERING, ETC. 57 the inside length. For example, in finding the length of stock needed to make a right-angled bend, as in Fig. 55, the length of the center line is 4} inches plus 4 inches, or 84 inches. The length of stock for a circle, such as Fig. 56, may be found from the formula,… … Thus for Fig. 56, 4’ (inside diameter) + 3’. +3”"’ =5’’, mean or working diameter. Mean circumference, and therefore required length of stock, is thus 5! X42 = 15.71". If this ring is to be welded an allowance must be made for the weld equal to the thickness of stock. Hence for a welded ring,…
Forging
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