Screw Thread Kinks

by Fred Herbert Colvin

Excerpt from Screw Thread Kinks

TO cut a left-hand thread, the handle I is lowered until gear F meshes with E. This makes L run in the reverse direction, as E, G and the intermediate run the same way. This is the Object Of the gear F, which is idle when cutting right-hand threads.

Having settled the direction in which the gears run, the next question is, the gears required to produce the right thread on the work. It is easy to see that if the lathe spindle and the lead screw revolve at the same rate, the carriage will advance one thread at each revolution and cut the same thread as the lead screw.

With the gearing shown in Fig. 1, this will not be the case, because the gear on the stud S has fewer teeth than the main driving gear E, so that the lead screw will turn at a slower rate, and cut a finer thread.

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126 pages, Paperback

Published August 24, 2018

About the author

Fred Herbert Colvin (1867–1965) was an influential American machinist, technical journalist, and author. Born in Massachusetts, he began his career as an apprentice at age 15, witnessing the transition to the Machine Age. He became a prolific writer, authoring or editing over 40 technical books and numerous articles on engineering. His most famous work, the American Machinists' Handbook, became a standard reference in the industry for decades. Colvin served as an editor for American Machinist magazine, where he promoted modern manufacturing methods. He was known for advocating for standardized parts and improved working conditions for laborers. During World War I and II, his expertise helped streamline U.S. industrial production for the war effort. In 1947, he published his autobiography, Sixty Years with Men and Machines, detailing industrial history. He remained active in the engineering community well into his 90s, offering a unique perspective on a century of progress. Colvin passed away in 1965 at the age of 98, leaving a lasting legacy in mechanical engineering.