Business screen magazine (1942)

SIDE FRAME: SUB-ASSEMBLY OF A WEB FRAME MM This subject presents in considerable detail the work of a shiplitter in sub-assembling a side frame. Views of a ship model, combined with animation, serve to show and explain the smooth taperinq surface of a streamlined hull and the role of side frames in holding the ship in shape. A detailed explanabon is given of the reversing of templates in laying off pairs of fiames. Attention is called to the fact that where unusual pressure and strain are to be counteracted the web frame is used. Closeups show the placing of a template on a steel plate, the scribing and the punching of the lines from the t;m plate to the steel plate, locating stiffeners giving the shape of the web frame, and marking the water and buttock lines. Lightening holes, stringer cutouts, and pipe openings are also located and punch marked. There is a detailed explanation by picture and by animation, combined with commentary, of the need for reversing temolates when making a pair of such web frames. The role of the buttock line and water line in locating parts of the web frame are indicated and explained. Also, the use of frame numbers, water lines, and buttock lines in locating the web frame in the ship is explained. The water lines and buttock lines are chalked and back marked on the web frame. The use of copper batting strips in butt welding the web to the frame is demonstrated. The blueprint calls for a flat bar face plate. The center line of the face plate is located. Guide nuts are tack welded to the face plate at the work lines. The face plate is then dogged in the proper position and tack welded. A lightening hole is located and cut and a flat bar ring stiffener is fitted in the lightening hole. The commentary explains the reason for these lightening holes and the use of the flat bar ring stiffener. The film closes with pictures and commentary emphasiz Tack Welding a Bracket ing the role of the blueprint in all jobs of the shipfilter. GIRDERS: SETTING A TRANSVERSE WEB FRAME AND A HORN GIRDER ^0 This training motion picture shows the work of the shipfitter and shipwright working together setting a web frame and horn girder. Considerable emphasis is given to laying off of center lines, frame lines, and buttock lines on the deck of the ship, fitting and setting the horn girder in terms of these lines, the various procedures used to shift the girder up and down, over and crosswise and to the definition of such words as camber, wooden batten, and spiel line. The job starts with the drawing showing and animated arrows explaining the location of web frames and deck beams, and illustrating and defining camber. The parts of the web frame which support this deck beam and the various holes that have been cut in each are named and explained. Throughout the entire process considerable emphasis is given to constant checking with the blueprint. Closeups show the punch marks which indicate the location of the center line and the wright striking the center line on the deck of the ship. The accompanying commentary emphasizes the necessity for absolute accuracy in striking this line and explains why it is desirable to mark each line. The resulting squares that are formed are checked by the 6-810 system for absolute squareness. Closeups show the wright beginning his measurement at the 1-foot mark on the tape line as the commentary explains that this practice makes for greater accuracy. The frame line, the 28-foot buttock line, and the 24-foot water Une are pointed out and their relationship to the setting and fitting of the girder explained. The web frame is lowered to the deck of the ship with the use of erection ribbands. The various symbols marked on the web frame are pointed out and explained. The declivity on the alignment on the web frame are carefully checked with the spirit level and declivity board. The use of a wooden batten in determining the amount of excess metal to be removed are demonstrated. The lines are marked, the excess metal is cut, the alignment is checked and this time the web frame fits. The spur shores needed to receive the deck beam and to adjust it to position for proper setting, are sawed and drilled. As the deck beam is swung by the crane, spur shores are bolted to it. Wedges under the shores enable the wright to raise or lower the deck beam or to shift it sideways as it is necessary. The A Web Frame Is Set and Fitted center line and the declivity of the beam are checked with the plumb bob and the declivity board. The plumb bob shows that the deck beam is properly centered, ready for the shipfitter. BULKHEAD: LAYING OFF THE BOUNDARY AND STIFFENERS ON A TRANSVERSE WATERTIGHT BULKHEAD This picture depicts the work of the shipfitter necessary to lay out the boundary and stiffener on a trarsverse watertight bulkhead. Considerable emphasis is given to a definition and explanation of base line, center line, water line, and buttock line; showing how these lines are locatnd and chalked on the bulkhead; demonstrating the knacks used to make certain that the lines are "scpiare"; and showing the use of templates to lay off stiffeners and other markings. The job starts with a check with the blueprint. The bulkhead is to be 24 feet high and 48 feet wide. Animation, combined with commentary, is used to locate and explain the starboard and the port side, buttock lines, and water lines. Templates are used to locate the center line, buttock line, water lines, and stiffener lines. The great care necessary to locate the center lines properly is shown and emphasized by a series of extreme closeups. The water lines and buttock lines are then struck and their squareness is checked by making certain that both diagonals of the same square are the same length. This method of checking squareness and the necessity for such constant checks are emphasized and explained by pictures and commentarv. The bulkhead is now shown with the 4-foot buttock lines and the 4foot water lines combined with the center lines to form 4-foot squares. Templates are now fastened to the bulkhead with mold loft clamps, care being taken that the water lines and buttock line on the templates, line up with those laid off on the bulkhead. To make certain that the templates remain in proper position, they are dogged down. A soap stone is used to mark the edge of the template and thus to indicate the excess trim. Closeups and commentary are used to emphasize the need for accuracy in this marking and the necessity for following all the edges in notches and angles. Soap stone marks are then center punched . Later these lines will serve as a guide for the burner. Using the templates, the location of the stiffeners is punch marked. When the templates are removed, circles are painted around these punch marks to assist the shiplifter in locating them later. Considerable emphasis is given in pic'.ure and commentary to the general practice of making the template for the starboard side of the ship and then turning them over to lay off the portside. The portside of the bulkhead is now laid off and punch marked in the same fashion. The templates are removed, the punch marks are circled with paint, and the fitter s'rikes the stiffener lines. The use of dogs and wedges in flattening a bulged portion of Laying Out the Bulkhead the bulkhead to secure a flat fit of a T-bar stiffener is demonstrated. The technique used in chipping a weld to secure a close fit of a stiffener is shown. The film closes with a view of the entira bulkhead doaged down, laid off. and fitted with stiffeners. BULKHEAD: LAYING OFF AND FITTING A CENTERLINE STIFFENER 8 ^^B This motion picture deals primarily with the work of the shipfitter in laying off and setting a center line T-bar stiffener to a water-tight bulkhead. This subject gives considerable emphasis to the advance planning of the work in terms of the most economical cutting of the T-bar stiffener and tripping bracket from an I-beam: the laying off of stiffener and brackets from templates; and the necessity for constant checking with the blueprint on the part of the shipfitter. An introductory sequence locates and gives the importance of bulkhead and explains the use of the center line stiffeners. The job starts with an examination of the blueprint and on the basis of this information, the shipfitter plans his work step by step. A T-bar center line stiffener is to be cut with a tripping bracket from an I-beam guickly and with a minimum wastage of material. Closeups of the blueprint indicate the size of Vifttfry Training Edition 25