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    By Shaun Griffiths

    This can be achieved in several ways. However, through the use of the parameter manager a projected 3D sketch and the shell command, we can make the design adaptable and easy to manipulate.

    Start with a sketch and drawing a circle with the desired diameter. It is a good idea to name the diameter and in this case I have named it “dia”.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_1.png

    This allows me to find it in the parameter manager.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_2.png

    Now I can extrude it and change the material.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_3.png

    Now, I can build a plane tangential to the surface and parallel to one of the origin planes to provide a plane to sketch upon.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_4.png

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_5.png

    With the plane in position, I can sketch out the geometry of my serrated edge. For the length of the sketch, I can set define it as “len = dia*PI” to provide me with the circumference of the cylinder.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_6.png

    In the parameter manager you can the build two user parameters, one being the number of teeth (tooth_no) and one which will be the width of the teeth based on the circumference (tooth_width) as below.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_7.png

    Then you can apply these parameters to your sketch.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_8.png

    Then pattern the triangle shape with the parameters made earlier to define the number of teeth and the width.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_9.png

    If you then finish the sketch, you can create a new 3D sketch and select project curve to surface, selecting the surface of the cylinder and then the sketch lines for the curve.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_10.png

    If you turn off the visibility of the 2D sketch and the work plane, you should be left with a cylinder with a sketch wrapped around the surface.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_11.png

    Next, I can use the split tool, to split the face of the cylinder with the sketch as the tool.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_12.png

    Next, you can select the faces you don’t need with the shell command which should leave the serrated edge.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_13.png

    Now you have an adaptable part.

    Inventor_-_Modelling_a_serrated_edge_on_a_cylinder_-_14.png