Choose an appropriate tool/machine combination for the following conditions: • The three machines being considered for t

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Choose An Appropriate Tool Machine Combination For The Following Conditions The Three Machines Being Considered For T 1 (45.53 KiB) Viewed 42 times

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Choose an appropriate tool/machine combination for the following conditions: • The three machines being considered for the Machine Considerations lab (manual, manual style with CNC controls, and VMC) • Part quantities of 10, 100, 1000 . A part that requires 1000 linear inches of machining • Shop rate of $75 per hour • Two flute .5" diameter endmill with .008" feed per tooth • Other information in the table below Tool Type HSS Carbide Cost (ca) $9.00 $28.00 Max CS [sfm] 200 1000 Time to replace tool [mins] 5 5 Taylor Tool Life Constants C n 0.125 0.25 350 2700
Cost per workpart Vmin Cutting speed Total cost per piece Cost of time to replace tool Tool cost Part handling time cost Machining time cost
. . . . Maximizing production rate = minimizing cutting time Production cycle time per part consists of: - Part handling time per part: Th Tm - Machining time per part: - Time to replace tool per part: T√/np np = number of pieces cut over the life of one tool Total time per unit product for operation (Cycle time-Tc): To Th + Tm+ Tv/np To is a function of cutting speed (v), tool path efficiency, fixture efficiency, ...
Production cycle cost per part includes: - Cost of part handling: Cost of machining: Cost of time to replace tool: CoTnp Tooling cost: Cilnp . - CoTh CoTm C₁ = cost rate for the operator and machine C₁ = cost of cutting tool • Total cost per unit product for operation (C): Cc = CoTh + CoTm+ CoTtnp + Cinp C is a function of v, just as T, is a function of v...