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A spur gear of 40 teeth is machined in a gear hobbing machine using a double start hob cutter. The speed ratio between the hob and the blank is

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in Machine Kinematics by (38.0k points)
A spur gear of 40 teeth is machined in a gear hobbing machine using a double start hob cutter. The speed ratio between the hob and the blank is

(a) 1:20

(b) 1:40

(c) 40:1

(d) 20:1

The question was asked during an interview.

My doubt is from Standard Spur Gears in chapter Toothed Gearing & Gear Trains of Machine Kinematics

1 Answer

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by (106k points)
Right option is (d) 20:1

For explanation: None.

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