Business screen magazine (1942)

T-bar stUfener, combined with views ol the I-beam and commentary explaining the planning ol the work. The template ia aligned to the beam, the water line, and edge of the template is punch marked on the beam itself. Chalk lines are struck for the center line and the cutting line. A brief sequence shows a cutting machine cutting the I-beam. The template is placed on the T bar thus formed The water lines are marked on the web and flange. Commentary stresses the necessity for accuracy in this work in rela tion to the proper fitting of the stiffener to the bulkhead and the bulkhead to the hull. On this particular job. a tripping bracket is to be used. This will be cut from the remaining portion of the Ibeam. Again a template is used. A punch marks the flange lines with 1-inch of material left for fitting. The tines for the tripping bracket are marked on the beam as the commentary calls attention to the skill needed in back marking the edges of the flange. Marking the 4-8-12 16-20-and-24 foot water lines follow on the T-bar stiffener. The bracket has been cut and the tripping bracket is fitted on the end of the main bracket. The next task is that of fitting the centr line stiffener to the bulkhead. Closeups call attention to ihe perfect alignment be tween the water lines on the stiffener and those on the bulkhead as the commentary stresses the importance of this alignment. To assist in securing this necessary alignment a flat bar is welded to the bulkhead. The stUfener is now tackwelded to the bulkhead by the shipfitter ready for production welding. Close Measuring to Speed Victory BULKHEAD: SETTING A TRANSVERSE WATERTIGHT BULKHEAD INTO HULL Q ^^ This subject demonstrates the work of the shipwright in setting and fairing a watertight bulkhead into a hull. Considerable emphasis is given to the location of the center tine, frame tines and buttock lines on the hull of the ship, the alignment of the same lines on the bulkhead to the hull lines, the technics used in shifting the bulkhead to bring it into the correct position, and the shoring of the bulkhead in position for fitting. The film opens with views of a bulkhead in position as the commentary calls attention to the importance of such bulkheads in strengthening the ship transversely. An overview of the entire job of setting the bulkhead is given by a series of views in miniature. The shipwright and his assistants first strike the center line and buttock lines on the innerbottom of the hull. Views of this work show the steps by which the Wright locates the center line, the frame line, and the buttock lines and strikes them on the innerbottom. Closeups show the marking of these lines with punches. The 3-4-5 method is demonstrated to check the 'squareness' of the frame line with the center line. Closeups show the location of the work line as the commentary explains the purpose and use of this line. The bulkhead already subassembled on the skids is lowered into the hull The commentary calls attention to the ribbands that are necessary to keep the bulkhead 'fair' during the process. There follows a detailed series of views demonstrating the methods by which the ship Wright moves the bulkhead, over, sidewise, and vertically in order to get it into the correct position. Closeups combined with animation and commentary call attention to Ihe use of spur shores and wedges, steamboat jacks and hy draulic jacks to shift the bulkhead into position. Closeups show the exact alignment of the lines on the bulkhead with those previously marked off on the hull. The position of the bulkhead is checked with a plumb bob held at the center line. There follows a detailed explanation by picture and commentary of the procedures used in checking the bulkhead for the correct declivity angle. These checks show that the bottom of the bulkhead needs trimming. A wooden batten is used to mark the bulkhead for the trimming Watertight Bulkhead in Position The bulkhead is now dropped into its position. The film closes with a series of views showing the bulkhead being checked for correct alignment and being found correct. DECK PLATES: REGULATING AND SETTING ^^^ This film shows Ihe work of the shipfitter and the shipwright in setting, fairing, regulating, and fitting, the deck plates of a ship. Emphasis is given to procedures used by the shipwright in setting and aligning deck plates, the work of the shipfitter in regulating and fitting the plates in their position. the use of a steamboat jack and angle bar clips and bolts for moving the plates are demonstrated. Animation, combined with the views of a model and commentary are used to show the location and the purpose of decks in a ship. The internal bracing that underlies each deck and the purpose of the deck plates in strengthening the ship transversely are explained. Animation, combined with closeup views show the work of the shipwright in locating and chalking the center line. Animation is also used to explain the placing of deck plates in rows or strakes outboard from the center line. Each strake of plates must be located with exact reference to the center or buttock line marked on the ship and on the nlate itself. Closeups show the shipwright locatina these lines and chalking them on the transverse deck beam. Plates are swung into position by a crane on top of the deck girders. This particular deck has milled scarphs 'to make flush points at the butt joints and side seams. Closeups combined with animation and commentary explain the use of steamboat jacks and ratchet and angle bar clips and bolts to draw the plates into exact position for welding. Closeups show the root opening as the commentary explains the purpose of this opening in making the necessary welds. Each strake of plates is checked by the shipfitter and the shipwright before it is tack welded into position. Closeups and commentary show the use of liner wedges, dogs, and flat bar fairing strips to provide flush joints for welding. The shipfitter checks Ihe fit of each strake of plates, the deck beams and girder. CloseuDS show the use of a clamp and bolt to bring the plate squarely on top the deck girder. A testing knife is used to check the steel to steel fit. The use of the strongback to straighten a plate bent or buckled during welding is shown in considerable detail. Bolts are tack-welded to the plate, the strongback is set over the bolts and the plate is straightened. The root opening on the seam is gaged and the plate brought flush for welding. The film closes with a brief review of the important points of the work of the shipfitter and the shipwright in regulating, fairing, setting, and fitting deck plates. Footages and cost of the individual titles above as well as the complete series of TEN SUBJECTS ON SHIPBUILDING SKILLS are on the same basis as previous reels reviewed (Individual titles may be purchased) ^^^^^^^ (All prices include the reel and can) SPECIAL NOTICE ^Vocational schools and colleges which are conducting courses for defense workers under the provisions of Public Law 146, 77th Congress, in cooperation with the U. S. Office of Education may purchase instructional materials including books and visual aids when such material can be shown by the school or college to be necessary for the instruction in courses approved under the provisions of the law. 2e BuninvMH Screen