It makes sense to climb when you can't use a backing to prevent tearout. I had to do it when rounding over the edges of the router bowl I posted recently in show and tell. The way to avoid the runaway cut problem is to take small climbing bites in the "normal" (i.e. non climb direction). See the picture.
Also, a spiral bit helps a lot. I think a shear would too but haven't tried it.
edit: fixed picture
Measure twice, cut once and CROSS OUT THE WRONG MARKS.
Last edited by PhilBa; 02-09-2016 at 01:13 PM.