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 . e general to note on thedrawing in the title of each piece, the number wanted for one com-plete machine, whether billed elsewhere or not. Specifications fcr Screw Threads. Exact drawings for the helixforming the thread of a screw are shown in Machine Drawing, PartII. These not only are difficult to draw, but they consume con-siderable time to produce accurately, therefore draftsmen have 16 MACHINE DRAWING ado
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 . e general to note on thedrawing in the title of each piece, the number wanted for one com-plete machine, whether billed elsewhere or not. Specifications fcr Screw Threads. Exact drawings for the helixforming the thread of a screw are shown in Machine Drawing, PartII. These not only are difficult to draw, but they consume con-siderable time to produce accurately, therefore draftsmen have 16 MACHINE DRAWING adopted certain conventions to represent the thread on workingdrawings. Some of these conventions are shown in Fig. 17. Herea represents a single, right-hand, square thread; b, a single, right-hand, sharp V thread, and its modifications, the United StatesStandard or Sellers thread, and the Whitworth thread; c representsa left-hand, sharp thread; d is the most common convention for anythread of a V=shaped cross section; e for any thread on a very smallbolt or set screw;/is a modification of d, there being no slope to thethread, which convention is preferred by some draftsmen; g repre-. f^^^ f-^ Fig. 17. Conventional Representations of Screw Threads sents a standard pipe thread, the taper on the sides of the pipe beingneglected. There are other conventions for threads in use, but the aboveare the most important ones. These certainly can not be mistakenfor anything else, which is the real test for any conventional repre-sentation of an object. Pitch. The pitch of a screw thread is the distance betweencorresponding points on two successive threads measured parallelto the axis. A small axial section is shown at D on the thread square groove, which gives the thread its name, has a depthequal to about J the pitch. Starting at the bottom, and followingthe edge of a thread in making one turn around the bolt, or from Ato B on the front and B to C on the rear, we find that the threadad
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectmachinery
