Hi Micahel,
Sorry to bother you about this again. I was trying to wrap my head around it and got stuck. Here is a picture of 2 curves. The idea would be I need to drop the pink curve down in the Y direction (black arrow) only enough to completely pass the wavy curve at all points, and no more.



The red line is the result of rhinos CrvDeviation command and is the largest space.

Can I move this pink line down by knowing the value of the red line? I thought I stumbled onto Danny's Bisector line as an idea to get a perp verticle line to use as a guide, but it was a little off too..

It alsmost seems like I need to do a "Y only" raster of the CrvDeviation command to get the result I need? (The angle of the red line thows off my planar Y move)

Thanks for any help...