Clipped From Iron
SHIP PLATE ROLLS. AMONG the mcst recent machines brought out in the United States in connection with shipbuilding is the set of plate tolls illustrated on page 69. This machine was built by the Niles Tool Works, Hamilton, Ohio, for the Norfolk Navy Yard, and is designed /or bending plates 1£ inches thick, and up to 16 feet long. It consists essentially of four heavy rolls of wrought-iron supported in a massive frame, and driven by a pair of reversing engines; the whole resting upon' a heavy bed plate, and thus being entirely self-contained. The centre rolls are placed one above the other, and are driven. The two outer rolls are placed on either side of the centre rolls, and can be set to give the desired curvature to the sheet. A separate pair of smaller engines is provided for handling these rolls in making the adjustments. They are raised and lowered by means of heavy worm gearing, both the outer rolls being moved in unison by means of the system of gearing shown. The machine is calculated to perform the heaviest duty, and accordingly has great power and strength, weighing, complete, 100 tons. The same company nave furnished a number of tools of various kinds to the navy department, and now have a contract on hand for a set of bending rolls similar to those illustrated, which it is thought will be the most massive machine of its kind ever built. It is to bend 1^-inch plates 22 feet long, and will have centre rolls 32 inches in diameter, weighing 35 tons each. The entire machine will weigh over 200 tons. A recent extensive enlargement of the Niles Tool Works enables them to handle such work with great facility.