Following data have been obtained for machining AA390 Aluminum, a Si-Al alloy.

Compute the K and n values for the Taylor tool life equation. How do these n values compare to the typical values?

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Cutting Speed (m/min) for Tool Life (m/min) of Workpiece Material Tool Material 20 min 30 min 60 min Sand casting Permanent Mold casting PMC with flood Sand casting 731 591 608 175 514 411 472 139 Diamond polycrystal Diamond polycrystal 642 517 554 cooling Diamond polycrystal C-K-20 85 s0 45 40 드151 -400 Ay.iegy..k g v, 3o ах» log T, log T, 25 32 min 20 234800 203 5080 010 ool i in minutes FIGURE 22-A End ingle point toola G- Plan Top Side view D FIGURE 22-8