Formula - Minimum number of teeth - To avoid interference

Q.  Which of the following formulae is used to determine minimum number of teeth required on helical pinion to avoid interference?
- Published on 19 Oct 15

a. (2ha cos3 Ψ) / (mn sin2 Φn)
b. (mn zp / 2 cos Ψn)(1+G)
c. 1.15 π mn / sin Ψn
d. None of the above

ANSWER: (2ha cos3 Ψ) / (mn sin2 Φn)

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    Discussion

  • Sravanthi   -Posted on 28 Sep 15
    Formula (2ha cos3 Ψ) / (mn sin2 Φn) is used to determine minimum number of teeth to avoid interference. As helix angle increases minimum number of teeth required to avoid interference decrease.
    (mn zp / 2 cos Ψn)(1+G) – This formula is used to determine centre distance between the axes of two mating gears
    (1.15 π mn / sin Ψn) -This formula is used to determine face width on gear tooth

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