How do I program an 8 figure oil groove?

Hi guys,
I need to cut some internal oil grooves in the 8 shape figure. It would also help for external grooves but not at this point.
The spindle encoder is hooked up and working correctly. 
If anyone has achieved this, please give me some hints.
Thx!

Huh?

Picture?

Which 8 shape figure?

like this?

Yes, this is what I am talking about. I attached a picture with a few oil groove patterns among which there are the grooves I am talking about.