Test 1 cheat sheet

Test 1 cheat sheet - R_a=average roughness R_rms=root mean...

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R_a=average roughness; R_rms=root mean square roughness; S_u=tensile strength; S_s=shear strength; S_y=yield strength; t_o=depth of cut; t_c=average chip thickness; P_c=cutting power; V=cutting speed; MRR=material removal rate; U=unit power; R=resultant force; F=friction force; N=friction normal force; F_t=thrust force; F_c=cutting force; F_s=shear force; F_n=shear normal force; f=feed; f_r=feed rate; RELATIONSHIPS : -low/high tolerance : good/bad manufacturing -low/high unit power : easy/hard to machine -low/high unit power : soft/hard material -low/high resolution : less/more precise measuring -slide/vernier caliper : less/more precise measuring -low/high ductility : low/high temperature -low/high strength : low/high tensile strength -low/high strength : high/low temperature -low/high tensile strength : low/high hardness -low/high hardness : high/low temperature -low/high hardness : bad/good tool performance -low/high shear angle : bad/good machining -low/high shear angle : high/low force -low/high shear angle : rough/smooth surface -small/high tool nose radius : sharp/dull cutting edge -small/high tool nose radius : fragile/durable cutting edge -small/high tool nose radius : consistent/inconsistent shear angle -small/high tool nose radius : smooth/rough cut -negative/positive tool rake : dull/sharp cutting edge -negative/positive tool rake : durable/fragile cutting edge -negative/positive tool rake : low/high shear angle -down/up machining : smooth/rough surface - down/up machining : same/opposite direction of feed -low/high frequency (EDM) : big/small cut -low/high frequency (EDM) : rough/smooth cut -low/high productivity : high/low time -low/high productivity : high/low cost -low/high productivity : low/high # of parts TERMS : -Parallelism : height max minus height min (delta h) -Roundness : radius max minus radius min (delta R) +Eutectic Point : V-point on a phase diagram (liquid above the V), lowest melting temperature -Eutectoid Point : V-point on a phase diagram (solid above the V), optimal Carbon % and hardness -Depth of Cut : distance from the original height of the object to the height after the cut -Shear Plane : extended line through the angle the chip gets forced up at -Shear Angle : angle between the shear plane and the original or final height of the object -Shearing Force : force that is directed along the shear plane line -Average Chip Thickness : thickness/width of the chip, not the depth of the cut -Top Rake Angle : angle between the line perpendicular to the object (line perpendicular to the velocity vector) and the face of the tool going towards the object -Chip Ratio : ratio between the depth of cut and the average chip thickness (r=t_o/t_c) -Resultant Force : vector from the tip of the tool to the tail of the thrust force vector and the tip to the friction normal force vector -Friction Force
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This note was uploaded on 11/08/2011 for the course ENTC 181 taught by Professor Hung during the Spring '08 term at Texas A&M.

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Test 1 cheat sheet - R_a=average roughness R_rms=root mean...

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