No problem!
Here's the steps you need to take for things like this in my opinion:
- create a plane for sketch geometry- either use an existing one, or create a new one like I did which is tangent to the edge of the cylinder
- create a 2d sketch on the plane you created and "project geometry" onto it. Simply select the curve you are trying to machine and you'll see the arc that you are trying to cut appear as a yellow line. Close the sketch
- create an axis under the "3d Model" tab for later use in your cam
- open your Cam tab and create a 2d contour operation
- Select your tool, and select the contour you are now going to cut (the yellow line in your sketch you just made.)
- Check the box under "tool orientation. Select the "select z axis/plane & X axis"
- Use the plane you created which is the direction of your z axis, in your machine this will be your x axis. but in milling it is your Z. Your post processor will take care of this for you when it comes to making your c axis orient correctly.
- In your Heights tab you can set your top height and bottom height accordingly- I used the model top, and offset the model top -1.05 to take the tool just past the center of the part.
- close the operation and right click on your finished operation, select "add to new pattern"
- under pattern type select circular pattern, and select that same center axis as before. this will now create two operations you can edit as 1.
I created one in a pattern, and one without for you. I used some roughing and multiple depths but that's all entirely up to you. Just wanted to show you how to go about it. Cheers!
