hole pattern on a non planar face

[Art K]

I am trying to complete a cad drawing of a piston. What I want to do is choose the face at the bottom of the oil ring groove for the 8 holes. It gives me the message that it is a non planar face. How would I go about this? thanks for any help you can give me. I realize I could easily drill the holes without adding them to the cad drawing but....
Art

 

[bigseb]

Circular hole pattern? Difficult to say without some kind of visual aid as to what you're trying to do...

 

[JST]

If the holes are radial holes, as I assume they are (very usual for such), then just create a tangent plane, do one hole, and then do a feature pattern.

You will probably need to project the oil ring groove edges to the sketch plane in order to properly locate the holes.

 

[DavidJ]

A 'non-planar' face is exactly that - not flat. Sketches have to be placed on a plane or a planar face, same for the hole tool. You'll have to arrange a plane to start on.

 

[HaroldL]

How would I go about this?

Like JST says, create a plane to place the sketch. Or place your sketch on one of the standard plane and Extrude Cut>Through All then circular pattern.

 

[Art K]

Hey everyone who replied thanks for your assistance, I did get it figured out.

Thanks for all your help
Art K