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 61
F/g 101 Fig. 102 F/g. 103 The method of drawing the helix has already been explained.Note the dotted line a-&, which indicates the undercutting ofsurface ahc^ and shows why a split nut cannot be removed froma square threaded screw. The sloping side of the Acme threaddoes away with this…
Mechanical drawing
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