Mechanical drawing; a treatise on the drawing of mechanical and machine details (1920)
Jones, Franklin Day, 1879-1967 · New York, The Industrial press; [etc., etc.] · leaf 275
awing of a largesquare thread is shown in Fig. 5. In this case there are twohelical curves, one representing the outer edge of the threadand the other the inner corner or root; therefore, two halfcircles are drawn. The radius of the larger circle is equal tothe outside radius of the screw, and the… … Fig. 6. Diagrams illustrating the Involute Curve whereas the points along the inner helix are obtained by pro-jecting lines from the smaller circle. If a number of threadswere to be drawn, as might be required on a drawing usedfor illustrating purposes, paper templets could first be laid offby the…
Mechanical drawing
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