how to model spur gear in cad
TRANSCRIPT
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7/21/2019 How to Model Spur Gear in CAD
1/5
20/8/2014 How to model spur gear in CAD
http://www.beyondmech.com/pro-e/cad-topic-23.html 1/5
Home List of Contents - ProE / Creo Downloads - CAD G space - Conc
HOWTOMODELSPURGEARINCAD
This topic explains how to model a spur gear in Pro engineer and Creo without gear
relations except for the involute curve.
Normally the following parameters are enough to manufacture a spur gear.
1. Number of Teeth
2. Module
3. Pressure Angle
4. Width
All other necessary parameters like pitch circle dia, root dia, base circle diameter etc. are
derived by standard set of gear formulas using these values.
But sometimes the manufacturer may have changed some of the values of a gear pair to
satisfy his own requirement. In this case, a table containing all the parameters is placed in
the gear drawing. This data is used to manufacture the gear. The job of the Cad modeler
will be to create the gear model using these values.
Lets see how to model the gear using the data given in the table (see left). To model the
gear completed using gear formulas read here.
You can download the gear drawings from the Downloads-Cadpage.
There are two cases. The root diameter can be larger than the base diameter or the base diameter may be larger than root
diameter. There are some changes in modeling the two cases. We will see that one by one.
Root diameter is larger than base diameter (see table):
1. Make a circle with 149.70 (Root diameter) and extrude it for 50 mm (Width).
2. Create three circles in the front face of the gear blank and name it in the model tree.
Pitch diameter - 156, Base diameter - 146.59, Outer diameter - 167.4
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7/21/2019 How to Model Spur Gear in CAD
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20/8/2014 How to model spur gear in CAD
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3. Create a new coordinate system at the center of the gear blank using the datums and front face as shown in the image. Name
it GEAR_CSYS for reference purpose. Make sure that the Z direction points outside, X horizontally and Y vertically. I recommend
to crate it as shown in the image (X and Y in positive direction). This coordinate will be used to create the involute curve from
equation.
Front view
4. Now the involute curve has to be created. In
ProE wildfire versions, go to Insert Model
datum Curve or use the short cut button.
This will open up the curve menu manager. Click
on From equationand Done. Now you have to
select the newly created GEAR_CSYS
coordinate. Then select Cartesian. This will
open the text window.
In Creo, type Curve in the search box at the
top right corner and select Curve from
equation from the list.
Now paste this equation in the text window.
Note: 146.59 is the base diameter.
Base_Rad = 146.59/2
Angle = t*90
Cir_len = (PI * Base_Rad * t ) / 2
X_Pnt = Base_Rad * cos(Angle)
Y_Pnt = Base_Rad * sin(Angle)
X = X_Pnt + ( Cir_len * sin(Angle))
Y = Y_Pnt - ( Cir_len * cos(Angle))
Z = 0
5. Create a sketch for circular tooth thickness (6.28 - see table) at pitch diameter from the intersection point of involute curve
and Pitch diameter as shown in the video..
Save the text window and close. Click done. This will create the involute curve.
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7/21/2019 How to Model Spur Gear in CAD
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20/8/2014 How to model spur gear in CAD
http://www.beyondmech.com/pro-e/cad-topic-23.html 3/5
Page Turning Softwareaxmag.com
aXmag, Turn your pdf file into page turning effect magazine6. Come out of the sketcher. Crate a new point at the center of the
circular tooth thickness curve using point option. To do that, go to
Insert Model datum Point point. Now click the newly created
curve and enter 0.5 in the input area as shown in the image.
7. Create a new datum using the point created in step 6 and the
center axis of the gear as shown in the image. This will be used to
mirror the involute curve.
8. Mirror the involute curve using the datum created in step 7.
9. Create a extrude for a single teeth. Use the two involute curves and the outer diameter and base diameter for the sketch.
Trim all other entities. Extrude the sketch to the next face.
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Read More Help T opics Here
9. Create the chamfer and radius.
10. Group the Extruded teeth, chamfer and the radius in the model tree.
11. Pattern this group using the center axis of the gear. 39 teeth (No. Of teet h) for 360 degrees.
12. Add center hole, key way cut and chamfer to the teeth side faces. T hats it we have a spur gear now.
To model gear with Base diameter larger than Root diameter. Next Page
Multiple methods can be used to model the gear. Just understand the concept. You can also do it on your own way combining
the steps.
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7/21/2019 How to Model Spur Gear in CAD
5/5
20/8/2014 How to model spur gear in CAD
http://www.beyondmech.com/pro-e/cad-topic-23.html 5/5
Taiwan Gear Manufacturergear-manufacturing.com/
Manufacturer of Spur / Helical Gear, Worm / Bevel / Pinion / Pump gear.
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