How to Generate Involute Gear in Pro E Software
This lesson covers the development of 'involute' gears. An involute gear is based on an involute
curve, which is a mathematical shape. This article includes simple steps for generating involute curves then followed by simple extrude in Pro Engineering software. Involute curve is generated by simple equation.
This article deals with complete procedure to make involute profiled gear modeling in Pro-Engineer software. Follow the steps to get ahead.
STEP:1 Generating involute curve by an equation.
Pick File, New,then enter < involute_gear > for the name of the new part Pick OK, in the ,New, dialog box Pick Insert, Model Datum, Curve, From Equation, Done, Select the default coordinate system, then pick CartesianIn the Notepad window, enter the following equations:
radius of the cylinder = 3.00
angle = t * 90
s = (3.14* radius of the cylinder * t ) / 2
Xc = radius of the cylinder * cos(angle)
Yc = radius of the cylinder * sin(angle)
X = Xc + ( s * sin(angle))
Y = Yc - ( s * cos(angle))
Z = 0 Pick File, Save and File, Exit in Notepad Pick OK in the dialog boxThe result is shown hereThis curve will be used to create an involute gear
STEP:2 Create a Cylinder.
Select the FRONT datum planePick the Extrude iconPress and hold the right mouse button and select Define Internal SketchPick Flip in the Sketch dialog boxPick Sketch in the Sketch dialog boxSketch a circle centred on the references, with a diameter of 6.500, to represent the Outside diameter of the gear (see the figure on the previous page) Pick the checkmark to complete the sketchEnter < 1.750 > for the depth then pick the checkmark in the dashboard toolPick View, Orientation, Standard OrientationThe result is shown below, be sure the curve is in front of the cylinder as shown
STEP:3 Create three circles representing the major diameters.
Create a circular sketch on the FRONT datum plane with a diameter of 5.376 to represent the root diameter of the gearCreate a circular sketch on the FRONT datum plane with a diameter of 5.638 to represent the base diameter of the gearCreate a circular sketch on the FRONT datum plane with a diameter of 6.000 to represent the pitch diameter of the gear The result is shown below
STEP:4 Create a datum point a datum curve.
Set the selection filter to Datums, pick the involute curve and the 6.000 diametercircular sketch, then pick the Point icon and then pick OK to create a datum point.Be sure the selection filter is set to DatumsPick RIGHT, TOP, and FRONT then pick the Point icon then pick OKPick Insert, Model Datum, Curve, DonePick the two datum points then pick Done and OKThe result is shown below
STEP:5 Create a datum evaluate feature.
Pick Insert, Model Datum, EvaluateEnter < measure > for the name of the featurePick Create, then enter < angle > for the name of the measurement parameterPick Angle, then pick the TOP datum plane and the curve you just created through the pointsPick Done then read the message window and look at the model treeSave the part
Pick the involute curve then pick Edit, CopyPick Edit, Paste SpecialAdd the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OKPick Rotate in the right mouse button popup menuPick the axis in the center of the cylinder then enter < -30 > for the rotation anglePick the checkmark in the dashboard toolThe result is shown
Double pick the copied involute curveDouble pick the 30 dimension In the small text box, carefully enter: angle: FID_MEASURE + ( 7.5 / 2 ) Pick Yes to add the relationPick Edit, RegenerateThe result is shown
STEP:6 Mirror the copied involute curve.
Pick the copied involute curve (the one created in task 7) then pick Edit, Mirror Pick the TOP datum plane then pick the checkmark in the dashboard tool The result is shown
STEP:7 Copy the curve again.
Pick the copied involute curve then pick Edit, Copy Pick Edit, Paste SpecialAdd the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OKPick Rotate in the right mouse button popup menuPick the axis in the center of the cylinder then enter < -15 > for the rotation anglePick the checkmark in the dashboard toolThe result is shown
STEP:8 Copy the curve again.
Pick the copied involute curve then pick Edit, Copy Pick Edit, Paste SpecialAdd the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OKPick Rotate in the right mouse button popup menuPick the axis in the center of the cylinder then enter < -15 > for the rotation anglePick the checkmark in the dashboard toolCreate an extruded (through all) cut using the edges of the curves as shown below Trim the sketch as shown below.
STEP:9 Pattern the cut.
Set the selection filter to Features then pick the cut you just createdPick Edit, Pattern, then set the type of pattern to Axis in the dashboard toolSelect the axis in the center of the cylinderEnter < 24 > for the number of instances in the patternPick the checkmark in the dashboard tool to complete the pattern
STEP:10 Finish the part.
Create a 0.020 round at the base of the gear toothPattern the roundCreate a coaxial hole with a diameter of 2.000Use Layers to hide the datum curves and sketchesThe completed part is shown belowSave the part and Close the window
I am using Pro E Wildfire 5. I cannot find the evaluate feature, refer step five. Is there any other way around it?