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Basic Fluid Power Formulas
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Virtual Machine Shop Forum  |  Machine Tool Technology  |  Questions, answers, ideas  |  Topic: Basic Fluid Power Formulas « previous next »
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Author Topic: Basic Fluid Power Formulas  (Read 245 times)
Geo.
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« on: November 29, 2016, 11:39:26 AM »

Basic Fluid Power Formulas
   Fluid Pressure (P) (PSI pounds per sq. in.)
   PSI = force / area (P= F / A)
   Fluid flow rate (Q) (GPM gallons per min.)
   GPM = Flow / Time (Q = V / T)
   Fluid power in Horsepower (HP)
   Horsepower = PSIG * Flow / 1714 (P * Q / 1714)




 Actuator formulas
   Cylinder area (A) (sq. in.)
   A = Pi (3.14) * R2 (Radius squared)
   Alterative - A = Pi (3.14) * D2 (Diameter squared) / 4

   Cylinder Force (F) (pounds)
   Force = PSI * Area (F = P * A)

   Cylinder Speed = (v) (feet per sec.)
   Feet /sec. = (231 * Flow rate) / (12 * 60 * Area)             (v = (0.3208 * GPM) / A)

   Cylinder Volume Capacity V
   Volume = Pi (3.14) * R2 (Radius squared) * Stroke / 231         (V = Pi * R2 * L /231)  (L = Length of stroke)

   Cylinder Flow Rate (Q)
   Volume = 12 * 60 * v * Net Area 2 (squared) / 231            (Q = 3.11688 * v * A)

   Fluid Motor horsepower (HP)
   HP = Torque * RPM / 63025  (HP = T * n / 63025)

   Fluid motor speed (n)
   Speed (RPM) = (231 * GPM) * Displacement (in)3         (n = (231 * GPM) / d)

   Fluid Motor Torque (T)
   Torque (in. lb.) = Pressure * Displacement (1n.3 / rev) / 6.2822      (T = P * d / 6.2822)
   Torque = HP * 63025 / RPM (T = HP * 63025 / n)
   Torque = Flow rate (GPM) * Pressure * 36.77 / RPM         (T = 36.77 * Q * P / n)
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