hw7_spring_09_soln

# hw7_spring_09_soln - EML 6267 Assignment #7 Spring 2009...

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Please remember to put your name on your assignment. Due: Monday, 3/30/09 1. (20 pts.) Complete problem 1 from chapter 5 of the text. a) (10 pts.) Up milling, 30% radial immersion To apply Eq. 5.2.3, we require the exit angle for the cut (denoted as φ 1 ). The exit angle for the 0.3 d , or 0.6 r , radial depth of cut is: () 4 . 66 4 . 0 cos 4 . 0 cos 1 1 = = = r r e deg. We calculate the mean y direction force using: e ne te t n t t t t t k k f k f k f k bN a π 0 0 sin cos 2 cos 4 2 sin 4 2 2 + + + = , where e must be expressed in rad. The result is 114.9 N. b) (10 pts.) Down milling, 40% radial immersion For the r a 8 . 0 = radial depth, the starting angle is: () 5 . 101 2 . 0 cos 180 2 . 0 cos 180 1 1 = = = r r s deg. We calculate the mean y direction force using: s ne te t n t t t t t k k f k f k f k bN a + + + = sin cos 2 cos 4 2 sin 4 2 2 0 , where s must be expressed in rad. The result is 298.0 N. 2. (20 pts.) Complete problem 3 from chapter 5 of the text. The first step is finding the variation in surface location error with spindle speed is to determine the start and exit angles for the 25% radial immersion down milling cut. The exit angle is 180 deg and the start angle is:

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## This note was uploaded on 04/23/2009 for the course EML 6267 taught by Professor Schmitz during the Spring '08 term at University of Florida.

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hw7_spring_09_soln - EML 6267 Assignment #7 Spring 2009...

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