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fe_01m - ME 466 Machine Design Summer Term 2001 Final Exam...

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ME 466 - Machine Design NAME ___________________________________ Summer Term, 2001 Final Exam, 200 Points, Open Book 1. (20 Points) The pinion in a gear set is a spur gear with 20 ° full depth teeth and a diametral pitch of 14. It has 28 teeth and rotates at a speed of 8,000 rpm. The mating gear has 42 teeth. They both have a face width of 1.00 inch and are made of alloy steel with a core hardness of 340 Bhn. The tooth profiles are done with a precision that justifies the use of curve C of Fig 15.24 and the assumption that the teeth share the load. The loading involves mild shock, justifying the use of K o = 1.25. Estimate the horsepower that can be transmitted with 99% reliability, based on tooth bending fatigue and a factor of safety of 1.80. HP: _____________ 2. (10 Points) The gears in the previous problem have been case hardened to 500 Bhn giving a high surface hardness. Estimate the horse power that can be transmitted for 2000 hours with 99% reliability and a 1.8 factor of safety, based on surface strength. HP: _____________ 3. (25 Points) A full journal bearing has a diameter of 50 mm, is 50 mm long, and supports a load of 2000 newtons at an operating speed of 800 rpm.
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