Extruding through a curved rib (and not beyond)

[CWitkowski]

Hi,

I am trying to make a cut along a curved rib, without extruding past the rib. The ribs are not straight when viewed from the top, nor is their profile straight from the side (see attachment - pics B & C are what I'm aiming for, drawn in Catia).

At the moment, as you can see in pic A, I have cut the two outer ribs by crudely extruding through them from an offset datum plane.

Is there a way that I can project a sketch onto the ribs, then extrude through them without passing beyond the other side of the rib, eg. stop the extrusion on the back surface?

Any help would be much appreciated.

Best regards,

Chris

 

[wombat109]

Try:
* rolling the model back prior to creating the ribs
* copy the base surface
* roll forward to the point you want to create the trim
* offset the copied surface to the height you want the ribs trimmed to
* close the quilt then solidify to remove material
you may want to throw in a few additional surfaces to tweak the area around the snap