11hw9-23mar-soln (1)

11hw9-23mar-soln (1) - EML4321HW#9Due23March,2011 1. You...

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EML 4321 – HW #9 – Due 23 March, 2011 1. You are to broach a keyway for a square key into a 1” diameter drilled-and-reamed hole in the center of a gear’s hub. The gear’s hub is 1.6” thick. The keyway is to be ¼” wide. The material is 200 HBN grey cast iron. The roughing teeth on the broach have a step of 0.005” per tooth and are spaced 3/8” apart. The broaching is to occur at 80 SFM. a. What is the average number of teeth cutting simultaneously? 1.6 0.375 = 4.27teeth b. What is the maximum number of teeth cutting simultaneously? If one tooth is about to leave there are 5 teeth in the cut. Therefore the maximum number of teeth engaged cutting is 5. c. What is the average force required to push the broach? 22 2 , 1500 217557 1 4.27 0.005 217557 4 s Nl Specific cutting force K mm in in lb teeth in tooth in == ⋅⋅ ⋅= 1161 lb b d. What is the maximum force required to push the broach? max 2 1 5 0.005 217557 4 in lb F teeth in tooth in =⋅ = 1360lb e. What speed (ft/min) should the broach be pushed at?
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11hw9-23mar-soln (1) - EML4321HW#9Due23March,2011 1. You...

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