# 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.

## 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 Cartesian
• In 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 box
• The result is shown here
• This curve will be used to create an involute gear
• ## STEP:2 Create a Cylinder.

Select the FRONT datum plane
• Pick the Extrude icon
• Press and hold the right mouse button and select Define Internal Sketch
• Pick Flip in the Sketch dialog box
• Pick Sketch in the Sketch dialog box
• Sketch 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 sketch
• Enter < 1.750 > for the depth then pick the checkmark in the dashboard tool
• Pick View, Orientation, Standard Orientation
• The 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 gear
• Create a circular sketch on the FRONT datum plane with a diameter of 5.638 to represent the base diameter of the gear
• Create 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 Datums
• Pick RIGHT, TOP, and FRONT then pick the Point icon then pick OK
• Pick Insert, Model Datum, Curve, Done
• Pick the two datum points then pick Done and OK
• The result is shown below

• ## STEP:5 Create a datum evaluate feature.

Pick Insert, Model Datum, Evaluate
• Enter < measure > for the name of the feature
• Pick Create, then enter < angle > for the name of the measurement parameter
• Pick Angle, then pick the TOP datum plane and the curve you just created through the points
• Pick Done then read the message window and look at the model tree
• Save the part

• Pick the involute curve then pick Edit, Copy
• Pick Edit, Paste Special
• Add the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OK
• Pick Rotate in the right mouse button popup menu
• Pick the axis in the center of the cylinder then enter < -30 > for the rotation angle
• Pick the checkmark in the dashboard tool
• The result is shown

• Double pick the copied involute curve
• Double pick the 30 dimension
• In the small text box, carefully enter: angle: FID_MEASURE + ( 7.5 / 2 )
• Pick Yes to add the relation
• Pick Edit, Regenerate
• The 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 Special
• Add the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OK
• Pick Rotate in the right mouse button popup menu
• Pick the axis in the center of the cylinder then enter < -15 > for the rotation angle
• Pick the checkmark in the dashboard tool
• The result is shown

• ## STEP:8 Copy the curve again.

• Pick the copied involute curve then pick Edit, Copy Pick Edit, Paste Special
• Add the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OK
• Pick Rotate in the right mouse button popup menu
• Pick the axis in the center of the cylinder then enter < -15 > for the rotation angle
• Pick the checkmark in the dashboard tool
• Create 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 created
• Pick Edit, Pattern, then set the type of pattern to Axis in the dashboard tool
• Select the axis in the center of the cylinder
• Enter < 24 > for the number of instances in the pattern
• Pick 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 tooth
• Pattern the round
• Create a coaxial hole with a diameter of 2.000
• Use Layers to hide the datum curves and sketches
• The completed part is shown below
• Save the part and Close the window

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Guest Author: Omar06 Feb 2013

I am using Pro E Wildfire 5. I cannot find the evaluate feature, refer step five. Is there any other way around it?

Guest Author: Mark H22 Oct 2013

Regarding this example, where did you ever refer to Base Diameter circle that is required to create the involute curve? Why apply a rotation angle of -30 degrees when the resulting curve/geometry is never shown on your screen shots?

MH

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