Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 57
Threads. — A screw is a cylindrical bar havinga helical projection. The form of this helical projection varies,according to the uses to which the screw is put. Screws areused for the following purposes: To fasten parts of machinestogether; to transmit motion; to convert rotation into transla-tion,… … 2 3 ^ S 6 7 a 9 10 II la I f/g. 60 distances around the cylinder. If a right triangle is woundaround a cylinder the hypotenuse will form a helix. The points1, 2, 3, 4, etc., of Fig. 80 will come at the same numbers on thecurve when the triangle is wound around the cylinder. Thepitch of a helix is…
Mechanical drawing
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