Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . the top edge ofthe plate In Fig. 34 a second method of laying out a tapered sheet isshown. The Fig. ABDC corresponds to the diagram ABDC,Fig. 33. Square up the line EF at the middle point of theline CD. Then locate any point as the point i, equidistant fromthe lines EF and ED. This may be done by drawing a lineparallel to EF at a distance from EF less than half ED, andthen by drawing a line parallel to BD at the same dist
Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . the top edge ofthe plate In Fig. 34 a second method of laying out a tapered sheet isshown. The Fig. ABDC corresponds to the diagram ABDC,Fig. 33. Square up the line EF at the middle point of theline CD. Then locate any point as the point i, equidistant fromthe lines EF and ED. This may be done by drawing a lineparallel to EF at a distance from EF less than half ED, andthen by drawing a line parallel to BD at the same distance the point 5, set the trams to the distance sC, and with 5 as acenter strike an arc intersecting the first dotted line; also setthe trams to the distance sA, and with 5 as a center, strikean arc intersecting the dotted line for the upper edge. Thenwith 4 as a center, setting the trams to the distance from 4to the intersection of the arcs just drawn with the first dottedline, strike the arcs intersecting the second dotted line, and re-peat this process for the points 3 and 2. Then the curve, whichis the true development of the edge of the plate, may be drawn. FIG. 34. from BD. The point where these two lines intersect is, ofcourse, equi^istartt from the lines EF and BD. This is shownby the circle which has been drawn from i as a center, andwhich is tangent to both of these lines. With i as a center,set the trams to the distance iD, and strike an arc intersectingthe line EF at E; also with i as a center, set the trams to thedistance iB and strike an arc intersecting EF at the point point E is one point in the curve of the lower edge of theplate, and similarly the point F is one point in the curve ofthe upper edge of the plate. It will be necessary to locate several other points in thecurve in order to determine it exactly. To do this, divide the through these points. The points 2, 3. 4 and 5 may be takenanywhere within their respective figures so long as they areequidis
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
