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#helicalGEAR #CEREBOTANI #MATURITà
Right- and left-hand helical gear cutters by the Fellows Gear Shaper Company, ca. 1922.
Edwin R. Fellows (May 29, 1865 – May 21, 1945) was an American inventor and entrepreneur from Torrington, Connecticut who designed and built a new type of gear shaper in 1896 and, with the mentoring of James Hartness, left the Jones & Lamson Machine Company to co-found the Fellows Gear Shaper Company in Springfield, Vermont, which became one of the leading firms in the gear-cutting segment of the machine tool industry.

Rispetto altri sistemi che vantaggi hanno i fellows?mi sembra lenta come esecuzione.
ci sono pochi millimetri tra fine dentatura e spallamento impossibile con il creatore

spur and helical gear cutting