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 . f length can be laid off alongor parallel to one of these lines, and all dimensions of breadthcan be laid off along or parallel to the other line. A plate is squared up as follows: Consider the plate shownin Fig. 3, which is to be laid out rectangular in shape with alength of-5 feet between the center lines of the rivet holes ateach end of the plate, and a width of 3 feet between theupper and lower rows of rivets. Assume the lap
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 . f length can be laid off alongor parallel to one of these lines, and all dimensions of breadthcan be laid off along or parallel to the other line. A plate is squared up as follows: Consider the plate shownin Fig. 3, which is to be laid out rectangular in shape with alength of-5 feet between the center lines of the rivet holes ateach end of the plate, and a width of 3 feet between theupper and lower rows of rivets. Assume the lap or distance drawn through C and D will be at right angles to, or squaredup with, AB. The lines for the other rows of rivets can now be drawn inas follows: Draw EF at a distance of 3 feet from AB, cut-ting the center line CD at M. Then with the trams set to thedistance AC and with M as a center strike arcs cutting EF atE and F. Join A and E, B and F, and then you have thecenter lines of the rows of rivets squared up and drawn inaccording to the dimensions called for. If the plate has beenordered to size and sheared with the corners square, a iJ/^-inch T>>. AB FIG. 6.—SIDE PATTERN. -V ^rl^ :t lo 0> ^ a- from center of rivet to edge of plate to be V/z inches. Thendraw a line for the lower row of rivets, as AD, 1% inchesfrom one edge of the plate. Locate the point A i]4 inchesfrom one end of the plate and D at a distance of 5 feet fromA. Put in center punch marks at A and B, and then locatethe middle point C of the line AB. This may be done bymeasurement, or with the trams as follows: Set the trams byguess at about half the length of AB, and with A and B ascenters strike arcs intersecting AB. These arcs will probablybe only a short distance apart, and of course the center ofthe line is at the center of the distance between the arcs. lap should remain all around the plate outside the rivet is never safe to assume that the edges of a plate, as itcomes from the mi
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
