Document LKKOa0RQ9eYKKLOKa2vMp3Jzg

This is a view of the Elliott motor-generator set taken across the outboard bearing pedestal oj the 3000-hp main drive motor. The two SOO-kw generators (one jor each reel drive motor) are on the near side oj the JSOO-hp, 73,2(X)-voll, 51-7rpm synchronous motor driver. Beyond the synchronous motor A view of the d-c control board, the very complex nerve center o, all the d-c machines. The Elliott C-W exciter sets are linn, up in front of the board. The motor room is spacious, wet, designed, adequately lighted, and it is functionally painted. is the 2500-ktv, 600-volt d-c generator which serves the main mill motor. Against the rear wall is the a-c control center and above that is the louvered opening through which air is re circulated to the air filter. All large machines are furnished with enclosing covers which direct the cooling air from the cellar, across each machine, and on out into the motor room. January 19, 1954, and placement ol concrete for the mill's heavy founda tions--1116 cubic yards in all--began less than a month later on February 18. Erection of the mill was started last August 30, and the first test run to the preceding coil and pulled and unwound by tension reels on of steel was rolled November 30. The Bliss 18 in. by 49 in. by 56 in. through successive baths of sulphuric either side of the mill, are supported single-stand, four-high reversing cold acid and hot water. After passing by two "back-up rolls." mill is designed to reduce hot-rolled through a trimming unit that pro The Newport mill is capable of pickled strip from 0.080/.130 in. to duces a machined edge by shearing handling coils weighing up to 40,000 finish gages of .015/.050 in. Hot- approximately a half inch from lb with an inside diameter of 24 in. rolled coils, having an inside diameter either side of the strip, the steel is and an outside diameter of 65 in. of 24 in. and a maximum outside recoiled on a tension reel. When reduced to .015 in. in thick diameter of 67 in. are fed from a 100- From the pickling line, the coils go ness the coiled strip of steel is kw drag pay-off unit, through a to the new reversing cold mill where, approximately 5800 ft long. threader levelcr (with over-running by screw-down pressure and tension, After being cold rolled, the coils clutch) to the mill, and wound on the the strip ofsteel is reduced to specified go to a continuous flying shear where 1000-hp winding reel. This reel is gage and finish. The main building the steel is uncoiled, flattened, and located on the entry side of the mill of the cold mill is 300 ft long by 100 cut to proper lengths and width ac and is used for winding and unwind ft wide and 63 ft high. The adjoining cording to ordered sheet specifica ing the coil for all succeeding passes. motor room, which houses the mill's tions. The sheets are then annealed The nominal top speed is 1775 fpm. electrical equipment, is of steel and in gas-fired, controlled-atmosphcre The mill and reels are controlled concrete block construction. The furnaces, arc temper-passed, and-- by a variable-voltage control system mill is known as a "4-high" mill be after thorough final inspection for to provide continuous speed adjust cause the two "work rolls," through surface finish, gage, and size--are ment from the low threading speed which the strip of steel passes back packaged for shipment. to any desired running speed. Speeds and forth as it is alternately wound Ground was broken for the project below 711 fpm are obtained by volt- 22 POWERFAX, SUMMER 1955