# 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.

**File, New,**then enter < involute_gear > for the name of the new part

**OK,**in the ,

**New,**dialog box

**Insert, Model Datum, Curve, From Equation, Done,**

**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

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

**File, Save**and

**File, Exit**in Notepad

**OK**in the dialog box

## STEP:2 Create a Cylinder.

Select the FRONT datum plane**Extrude**icon

**Define Internal Sketch**

**Flip**in the

**Sketch**dialog box

**Sketch**in the Sketch dialog box

**View, Orientation, Standard Orientation**

## STEP:3 Create three circles representing the major diameters.

**root diameter**of the gear

**base diameter**of the gear

**pitch diameter**of the gear

## 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.**OK**

**Insert, Model Datum, Curve, Done**

**Done**and

**OK**

## STEP:5 Create a datum evaluate feature.

Pick**Insert, Model Datum, Evaluate**

**Create**, then enter < angle > for the name of the measurement parameter

**Angle**, then pick the TOP datum plane and the curve you just created through the points

**Done**then read the message window and look at the model tree

**Save**the part

Pick the involute curve then pick Edit, Copy

**Edit, Paste Special**

**Apply Move/Rotate transformations to copies**in the dialog box then pick

**OK**

**Rotate**in the right mouse button popup menu

Double pick the copied involute curve

**Yes**to add the relation

**Edit, Regenerate**

## STEP:6 Mirror the copied involute curve.

Pick the copied involute curve (the one created in task 7) then pick**Edit, Mirror**

## STEP:7 Copy the curve again.

**Edit, Copy**Pick

**Edit, Paste Special**

**Apply Move/Rotate transformations to copies**in the dialog box then pick

**OK**

**Rotate**in the right mouse button popup menu

## STEP:8 Copy the curve again.

**Edit, Copy**Pick

**Edit, Paste Special**

**Apply Move/Rotate transformations to copies**in the dialog box then pick

**OK**

**Rotate**in the right mouse button popup menu

## STEP:9 Pattern the cut.

**Features**then pick the cut you just created

**Edit, Pattern,**then set the type of pattern to

**Axis**in the dashboard tool

## STEP:10 Finish the part.

**Layers**to hide the datum curves and sketches

**Save**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?