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 . forged to the required shapes. From thesedimensions the layer out must find the exact size and shapeof every piece of material when laid out flat, so that after ithas been cut out and shaped by these lines it will be of ex-actly the required size and shape and fit accurately in itsproper place. To get this result, the layer out must not onlyunderstand how to find the development of different surfaces,but he must also know how th
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 . forged to the required shapes. From thesedimensions the layer out must find the exact size and shapeof every piece of material when laid out flat, so that after ithas been cut out and shaped by these lines it will be of ex-actly the required size and shape and fit accurately in itsproper place. To get this result, the layer out must not onlyunderstand how to find the development of different surfaces,but he must also know how the material will behave when itis being bent, flanged, forged, etc., for in some instances themetal will be drawn out, or gain in length, while in othersit will be upset, or lose in length. Allowances must be madefor these losses and gains when the plate is laid out, and while, in certain cases, rtiles can be given for this, the mostsuccessful man will have to depend upon his experiencefor this knowledge. For this reason every layer out shouldbe a practical boiler maker, and have a thorough understand-ing of the boiler makers trade, as he will then more readily. J FIG. 2.—MEASURING WHEEL. understand when such allowances should be made and howmuch they should be. Most of the tools and instruments used by a layer out inhis work are well known to a boiler maker and need little ex-planation. The lines are drawn in with chalk or soapstonepencils. Long, straight lines are snapped in with a chalk ones are drawn in with a steel straight edge. Circlesare drawn with trammels, or, as they are more commonlycalled trams, a sketch of which is given in Fig. i. >i
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
