The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . )ounds. It consists of two semi-circular heads, separated by strong columns, and united byheavy steel bands, between which is a cross-head operatedby a large steel cylinder in the uj)per head and small re-turn cylinders in the lower head. Power is supplied by adirect-acting plunger-pump, which maintains a constantflow of oil from an overhead tank. The movement ofthe coining-head is controlled by a lever. The pressurea])j>lied is determined by an adjustable safety-valve. Thehead is m
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . )ounds. It consists of two semi-circular heads, separated by strong columns, and united byheavy steel bands, between which is a cross-head operatedby a large steel cylinder in the uj)per head and small re-turn cylinders in the lower head. Power is supplied by adirect-acting plunger-pump, which maintains a constantflow of oil from an overhead tank. The movement ofthe coining-head is controlled by a lever. The pressurea])j>lied is determined by an adjustable safety-valve. Thehead is made to move at the rate of an inch a minute whenunder pressure, and three feet a minute when comingtowards or from the work. This same form of press isused for punching and stripping, or may be made to do thework of a drop-press or MACHINE TOOLS. 255 The bending of plates of metal is accomplished betweensets of rolls, which may be adjusted so as to give any curveto the plate. Four rolls are commonly used, one pair beinglarger than the other two and being used for compressionand to carry the plate. The smaller rolls do the machine, Fig. 60, is of the largest size made in thiscountry, and will bend cold steel ship-plates twenty-twofeet wide and two inches thick. It was built by the XilesTool-Works for the Mare Island Navy-Yard, and weighstwo hundred and fifty tons. It is operated by independentengines, as shown, for driving the rolls and adjusting theirposition. Two heavy pinching- and feeding-rolls arethirty-two inches in diameter, the beuding-rolls beingtwenty-five and a half inches thick. Graduated index-scales are provided to show the operator just how his rollsare set. The machine is designed to rest on masonry belowthe floor surface, so that the plates can be run in from thelevel of a low truck.
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectmechanicalengi
