How do I draw "o" ring groves in a hollow cylinder

[grits]

Hello Everyone

This is my first post. I am an amateur machinist from Little Rock. I do primary gun work but also occasionally build parts for some of my specialized farm equipment.

I am drawing a hollow cylinder that will have external "O" ring groves. I have not a clue how draw the groves in the cylinder and, for the life of me, I cannot figure it out.

Thank you for any and all suggestions.

Have a great weekend.

Grits

[Tech3]

Please review: Boundry of Revolution and Groves

[grits]

Thanks Tec3

Grits