Fig. 2936.
As an example in bending, let it be required to bend a straight shaft into a crank shaft, and the following method (from “The Blacksmith and Wheelwright”) is pursued. The shaft is first bent as in [Fig. 2934]. The piece is next bent as in [Fig. 2935], and finally as in [Fig. 2936], the corners a a and b b corresponding in all the figures.
Fig. 2937.
Blacksmith’s Bending Blocks.—In cases where a great number of pieces of the same size and shape are required to be bent during the forging process, a great deal of time may be saved and greater accuracy secured in the work by the employment of bending devices. Thus, in [Fig. 2937] is shown at a a clip requiring to be bent to the shape at b. A pair of tongs is provided with a hole at c to receive the stem of the clip, and the jaw d is made of the necessary width to close the ends of the forging upon. It is obvious that the hole c being in the middle of the width of the tong jaw, the wings will be equidistant from the pin.