HW4sol - Homework #4 ME 363 1. (a ) VT n = C 350 (7) n = C...

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Homework #4 ME 363 1. () ( ) 0.17 2.852 () 350 (7) 350 7 250 50 250 (50) 350 7.142 250 0.17 C 487.2 ( ) high speed steel (c) 300 ( ) 487.2 0.17ln ln(487.2 / 300) ln 2.852 17.3 min (d) n n nn n n a VT C C C n b T T T Te V = ⋅= = == = = ∴= = = 0.17 487.2 ft 392 min 10 =
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2. () 0.23 0 min 0 min 0.23 min 0 00 300 50.5 739.4 1 1 35 1.75 2 1 60 1 35 0.23 60 16.74 min 739.4 V 386.7 . 16.74 n tc n tt a VT C CT C T nC C fpm T b CC TT T TC LD L CT fN fV π = ⋅= ⎛⎞ + =− ⎜⎟ ⎝⎠ ⎡⎤ + ⎢⎥ ⎣⎦ = == = ×× + + + ⋅⋅ 0 0 0 18 3 5.22 min 0.007 386 12 35 5.22 $3.05 60 5.22 1.75 $0.55 16.74 35 5.22 2 $0.36 60 16.74 35 1.8 $1.05 60 $3.05 $0.55 $0.36 $1.05 $5.01 t c VD CT C CT C T CT T Cost ⇐= Ν ×= × = × = ⋅× = = =+++=
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3. Slab milling () ( ) 3 0.15 0.67 0.01 8 150 12 c mt Dd i n ff n N =⋅ = = =⋅⋅= ×× = A 20 0.67 1.723min 12 c m CT f + = + == AA Material removal rate 3 6 0.15 0.01 8 150 in 10.8 min 10.8 2.1 22.7 m s MRR w t f Power MRR HP HP × ×× = =
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HW4sol - Homework #4 ME 363 1. (a ) VT n = C 350 (7) n = C...

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