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VinZero | An Arkance Company

Inventor - Modelling a serrated edge on a cylinder

March 15, 2022 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 comm and, 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”.

This allows me to find it in the parameter manager.

Now I can extrude it and change the material.

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.

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.

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.

Then you can apply these parameters to your sketch.

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

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.

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.

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

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

Now you have an adaptable part.

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