MidtermFormula2 (1)

# MidtermFormula2 (1) - 3190U Midterm Formula Sheet 2010 1n...

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3190U Midterm Formula Sheet – 2010 = = n i i a y n R 1 | | 1 D C = D P + D P S + D P S 2 d x s D D r / = b d x Q Q Q - = A A Nd D Q c d cos sin 5 . 0 2 2 π = , D p A = tan L A Dd p Q c b η 12 sin 2 3 = 2 max cot 6 c d A DNL p = Q x = K s p d d s L D K 128 4 = p p Q Q Q x ) / ( max max max - = = dl dp A Dd Q c b 12 sin 2 3 r sd = D p / D d , r st = t p / t d , t p = r sd 2 t d t m = D p t p / D m , t m = r sd 3 t d D d / D m P = 2σt m / D m 1

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Chapter 26 ECM: I = E / R = E / (gr/A) = gr EA I = current (amps), E = voltage, R = resistance g = gap between electrode and work (mm, in) r = resistivity of electrolyte (ohm-mm, ohm-in) A = surface area between work and tool in the working frontal gap (mm 2 , in 2 ) ECM: V = CIt = gr CEAt V = volume of metal removed (mm 3 , in 3 ) I = current (amps, amps), t = time (s, min) C = constant - specific removal rate, depends on work material (mm 3 /ams-s, in 3 /amp-min) ECM: A CI gr CE At V f r = = = , f
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MidtermFormula2 (1) - 3190U Midterm Formula Sheet 2010 1n...

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