I’m a Luthier and I use Rhino for modeling my guitars and making templates.
This is a common issue for me:
On the right there’s the template I designed for cutting out the piece on the right. I use a 1/2’’ router bit for the cut, with a ball bearing to copy the template. The black circles are the areas were, due to the size of the router bit, the cut is more rounded than expected.
How could I modify my curves so that they look exactly as they will turn out on reality, based on the size of the router bit?