Gear CalculationsExternal Gear Pump Parameter Calculation Sheet2.972 Understanding How Things WorkInput Values in BLUE, Do NOT Change Values in REDGroup?Date:?ValueVariableDimensionHow To Get ItNo. of Teeth11[ N ]teethYou ChoosePitch (Diametral)6.93[ p ]1 / in= N/PDPressure Angle30.0[ f ]degreesUsually Standard (14.5, 20, 25, 30)Adendum Diameter1.875[ AD ]in= PD + 2*aDedendum Diameter1.226[ DD ]in= PD - 2*dPitch Diameter1.587[ PD ]inYou ChooseAdendum0.144[ a ]in= 1.00/pDedendum0.180[ d ]in= 1.25/pMinimum Number of Teeth to Avoid UndercutInput to Omax Waterjet SoftwareFor NoFor AcceptableNo. Teeth11teethPressure AngleUndercutUndercutdegrees# teeth# teethPitch6.931 / in14.53220Pressure Angle30.0degrees20.0181425.01210

Volumetric EfficiencyCalculation For Gear Pump FlowBy: Martin L. CulpepperDate: 01/02/99Enter Values in BLUE, values in RED are calucated and should not be changed!General Input:Data For an Exact ConditionDisplacement0.50in3/revShaft Speed500rpmPressure Change100psiSlip Flow1.5in3/sSlip Flow Coefficient0.015---Ideal Flow4.2in3/sActual Flow2.7in3/shv0.64---Data For GraphsShaftIdealSlipActualVolumetricSpeedFlowFlowFlowEfficiencywQiQsQahv00.001.50-1.50N/A5004.171.502.670.6410008.331.506.830.82150012.501.5011.000.88200016.671.5015.170.91250020.831.5019.330.93300025.001.5023.500.94350029.171.5027.670.95400033.331.5031.830.96

Volumetric Efficiency01.5-1.50.644.16666666671.52.66666666670.828.33333333331.56.83333333330.8812.51.5110.9116.66666666671.515.16666666670.92820.83333333331.519.33333333330.94251.523.50.948571428629.16666666671.527.66666666670.95533.33333333331.531.8333333333

Ideal FlowSlip FlowActual FlowVolumetric EfficiencyShaft Speed, w, rpmFlow, Q, in3/sVolumetric Efficiency, nvExternal Gear Pump Flow Characteristics