Formula - Velocity factor - Gears manufactured by hobbing process

Q.  Which of the following formulae of velocity factor (K) is considered if helical gears of medium accuracy are manufactured by hobbing process followed by shaving?
- Published on 23 Sep 15

a. 5.6 / (5.6 + √V)
b. √5.6 / (5.6+ √V)
c. 6 / (6+V)
d. 0.85

ANSWER: 5.6 / (5.6 + √V)

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    Discussion

  • Sravanthi   -Posted on 28 Sep 15
    If gears are manufactured by hobbing process followed by shaving permissible pitch line velocity is considered less than 30 m/s and velocity factor is calculated using the formula 5.6 /(5.6 +√V). These gears have medium accuracy level and usually IS grades of 6,7,8 or 9 are used.

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