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Machinists' and draftsmen's handbook, containing tables, rules and formulas, with numerous examples explaining the principles of mathematics and mechanics as applied to the mechanical trades; intended as a reference book for all interested in mechanical work (1910) Lobben, Peder, 1858- · New York, D. Van Nostrand company · leaf 438
r on the lead-screw be moved, when changingfrom one thread to the next ? Solution: A screw of >^-inch lead with triple thread has six threads 2 X 96per inch, therefore the gear must be moved —^—- = 32 teeth, in order to change the tool from one thread to the next. _60^ U. S. Standard Screws.… … SCREWS. 419 flat at the top and bottom for a distance equal to one-eighth ofthe pitch, thus the depth of the thread is only three-fourths ofa full, sharp thread. (See Fig. 1.) Fig. 2 shows the shape of the Whitworth (the English) sys-tem of thread. As compared © ^ with the American system,… Mechanical engineering
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