as a quick thought, possibly overkill...
extude a flat square patch
fold to large pipe OD
cut the smaller pipe's intersection
unfold
offset the hole to provide a constant thickness, extrude as intersect
refold back
as i said, probably complete overkill (and still not what you want)...
just a thought, Sam
wrote in message news:6363584@discussion.autodesk.com...
When you project two circles to the cylindrical face, the inner circle is
not round anymore and then the width is not constant. The problem of bending
is the deformation in the solid.