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Determining the Shaper Cut Helical Gear Fillet Profile

05FTM14

05FTM14
Author: G. Lian, Amarillo Gear Company
This paper describes a root fillet formcalculatingmethod for a helical gear generated with a shaper cutter. The
shaper cutter considered has an involutemain profile and elliptical cutter edge in the transverse plane. Since
the fillet profile cannot be determined with closed form equations, a Newton's approximation method was
used in the calculation procedure. The paper will also explore the feasibility of usinga shaper tool algorithmfor
approximating a hobbed fillet form. Finally, the paper will also discuss some of the applications of fillet form
calculation procedures such as form diameter (start of involute) calculation and finishing stock analysis.
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