Design a pair of spur gears to be used as a part of the drive for a wood chipper

Question

Design a pair of spur gears to be used as a part of the drive for a wood chipper (heavy shock driven machine) in a paper mill. An electric motor (uniform driver) transmits 3.0 horsepower to the pinion at 1750 rpm and the output gear must rotate between 460 and 465 rpm. The gear set must survive 3000 hours of operation. A possible solution is: 18 tooth pinion and 68 tooth gear with diametral pitch of 12 and face width 1 inch, both made of 250 HB grade 2 steel. Assume reliability of 0.99 and near room temperature operation. Can this design be approved? If not, what could be modified so that it can?

Explanation / Answer

As per the requirements to design spur gears, the data provided shows that this design can be approved.

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