For a spur pinion with a speed ratio of 2.5 to 1 and 20° pressure angle full-depth teeth, what is the smallest number of teeth allowable before interference occurs?
Added by Brad B.
Step 1
5 to 1 and a 20° pressure angle before interference occurs, we can follow these steps: ** Show more…
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The minimum number of teeth on the pinion to operate without interference in standard full height involute teeth gear mechanism with 20° pressure angle is,
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The decision has been made to use $\phi_{n}=20^{\circ}, P_{t}=6$ teeth/in, and $\psi=30^{\circ}$ for a $2: 1$ reduction. Choose the smallest acceptable full-depth pinion and gear tooth count to avoid interference.
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