Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . inch per foot, that is, the diameter of the MACHINE DRAWING 27 TABLE VStandard Sizes of Wrought=Iron Pipe Nominal Size Vs k % H % 1 1M 1H 2 Actual InsideDiameter .27 .364 .494 .623 .824 OutsideDiameter .405 .54 .675 .84 Nominal Size 2V2 3 2V2 4 4^ 5 6 7 8 Actual InsideDiameter OutsideDiameter
Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . inch per foot, that is, the diameter of the MACHINE DRAWING 27 TABLE VStandard Sizes of Wrought=Iron Pipe Nominal Size Vs k % H % 1 1M 1H 2 Actual InsideDiameter .27 .364 .494 .623 .824 OutsideDiameter .405 .54 .675 .84 Nominal Size 2V2 3 2V2 4 4^ 5 6 7 8 Actual InsideDiameter OutsideDiameter TABLE VIStandard Threads for Wrought=Iron Pipe —^———-—^——^————— NominalSize of Pipe H H H H H 1 IX IK 2 Threads perInch 27 18 18 14 14 ny2 nx uy2 UK NominalSize of Pipe 2V2 3 sy2 4 4^ 5 5V2 7 8 Threads perInch 8 8 8 8 . 8 8 8 8 8. holes decreases at the rate of j inch per foot. In representing a holewhich is threaded with a pipe tap, the hole is drawn of a diameterat its larger end about equal to the outside diameter of the pipewhich is to be screwed into it, andis drawn tapering. It is well to makethe taper considerably greater thanthe actual taper, so that the personlooking at the drawing may see at aglance that the hole is for a pipe. The thread is indicated in one ofthe conventional ways previously explained, but the number ofthreads per inch and the diameter of the hole need not be given;instead, a note is made that the hole is tapped for a certain sizepipe. Fig. 29 illustrates this. Tables V and VI which show the standards for wrought-ironpipe may be found convenient. Scale Drawings* When the object which is to be drawn is notso large but that it can be easily shown actual size (or full size as it Fig. 29. Conventional Drawing ofThread in a Pipe Fitting 28 MACHINE DRAWING is called) on a sheet of paper of
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectmachinery
