Unformatted text preview: HW#9 Gears Due Apr 16 (Fri) 3 pm 1. Use the Excel or MatLab to plot the involute curve for a scroll pump with based circle with 2 mm radius. 2. A 21tooth spur pinion mates with a 28tooth gear. The diametral pitch is 3 teeth/in and the pressure angle is 20. Find the following results: Addendum, dedendum, clearance, circular pitch, tooth thickness, basecircle diameters; Lengths of the arc of approach, recess, and action Contact ratio ...
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 Winter '10
 Shih
 gear, 21tooth spur pinion, action Contact ratio

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