Can't machine a round slot with compound curve edges

[jasonmtbx]

Hello, 

I can't seem to figure out how to machine this round slot with a ball end mill that is the same diameter. I tried creating a line in the middle so I could trace it with tip comp off, but since the edges are compound curves, it won't let me pick up the mid point.

Any help is much appreciated, thanks.

[seth.madore]

Help is going to be limited without the file. Can you share it?
File > Export > Save to local folder, return to thread and attach the .f3d file in your reply

[jasonmtbx]

Of course, here you go: 

[daniel_lyall · Accepted solution]

See if this helps, example attached.

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[seth.madore · Accepted solution]

Thanks @daniel_lyall , you replied while I was waiting for my ScreenCast to upload. Not to let a good Cast go to waste, here's another slightly different method to accomplish basically the same thing:

[jasonmtbx]

Perfect, thank you both!