11hw8-16mar - EML 4321 - HW #8 - Due start of class 16...

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EML 4321 --- HW #8 --- Due start of class 16 March 1. A dental drill has a top speed of 350,000 rpm. A size 56 (0.9 mm diameter) burr with six cutting edges is mounted in the drill. a. What is the maximum cutting speed (SFM)? b. What is the maximum tool passing frequency (Hz)? 2. Consider the figure below taken from the knife in a biomass harvester (used near a biomass-to-biogas-to-IC engine-to-electricity) facility near Dresden: The white is a cross-section of the knife. The right (rough) side of the knife is the rake face. The left side (smooth edge slanting from top center) is the relief or clearance side. 400u indicates a length of 400 micrometers. (Figure from: Wild, K., Walther, V., and J. K. Schueller. 2010. Verschleißverhalten von Feldhäckslermessern beim Einsatz in der Praxis. VDI-Berichte Nr. 2111, Tagung Landtechnik 2010, S. 307 – 312.) a. If the clearance angle is 0 degrees, what is the rake angle? b.
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11hw8-16mar - EML 4321 - HW #8 - Due start of class 16...

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