I'm not Brad, but yes Brian..in order for a given program to work part to part - it would in fact require the same contour rib to rib.
Programs can be adjusted fairly easily to accommodate a different contour.
If I was matting new ribs and had several barrels with variable (yet close) contours, I'd be inclined to run a cut along the entire rib surface followed by the matting cycle.
The pre-cut would ensure perfect depth of the matting cuts part to part.
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