Discussion
Standard value of dedendum is equal to
Answer: B
The standard dedendum is 1.157 X Addendum.
In the module system the addendum is 1 m and the dedendum is 1.157 m, so the dedendum equals 1.157 times the addendum. The extra 0.157 m is the clearance, which keeps the tip of each tooth from touching the root of the mating gear.
A dedendum equal to the addendum would leave no clearance. 2 × module is the working depth, and 0.157 × module is only the clearance itself. (Some standards use a dedendum of 1.25 m, but the 1.157 m figure is the one this paper uses throughout.)
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