On Mar 2, 11:10 am, Jay Pique wrote:

...

There are certain applications where it would be nice to not have to
worry about blow-out when template routing. Specifically, cutting the
left and right door jamb to fit an angled sill. We use one-piece
jambs, with the stops rabbeted in, and it's a bit time consuming to
clamp backer blocks to the potential blow-out areas. My thinking was
that I could start the cut with a right hand bit, and come in from the
other side with a left hand bit.


ISTR that shapers can be run in reverse
and the typical shaper cutter can be turned
upside down to reverse the direction in which
it cuts.

That would allow one to cut mirror image profiles
with the same cutter, though of course you can
do the same thing by flipping the workpiece upside
down.

--

FF