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 68
Fig. lid r/g //7 … Fig. 119 designated as taper, plug, and bottoming taps (Fig. 116). Theoperation is as follows: First a hole is made with a drill havinga diameter about equal to the root diameter of the screw. Sucha drill is called a tap drill. The thread is then cut by insertingand turning in the taps illustrated,…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
