Embossed pattern doesn't meet up correctly

[HomeBarry]

I am trying to create an embossed pattern around a ring. I have tried two methods to try to establish the boundaries of where the sketch should finish in order to match up when patterned 10 times around the ring but niether worked.

For the first method I sketched the 36 degree angle from the centre of the ring and extended the lines onto the work plane tangentally drawn against the ring. This produced a pattern which overlapped.

The second method used a 3d sketch on the surface of the ring which was then projected onto the work plane. This produced a pattern which did not meet up.

I am using Inventor Professional 2022

[-niels- · Accepted solution]

Just to add some explanatory text:

Dimension the length of the shape with the formula "PI * Diameter / number of instances", then emboss and make a circular pattern of that same amount of instances.

[blandb · Accepted solution]

You are just projecting edges and that will not physically "unwrap" the arc length onto the plane. That is why you are short.

[johnsonshiue]

Hi Barry,

Please share the file here. I would like to understand the pattern behavior better.

Many thanks!

[HomeBarry]

OK so now I feel like a bit of a ninny. I was sure that I had tried the "divide the circumference by the number of repetitions" method, but apparently not.

Anyway I have now and thanks to @-niels- and @blandb for their assistance.

Here is the resulting pattern which matches perfectly now. I have also added the file that I used to generate the shape.