Mark,

The concept of the Gougeon 'saw device' and Glenn's router jig are 'really
neat' from an 'engineering solution' point of view. However, unless you have
a trailer load of ply, or an 'in situ' piece, they are also in opposition to
another engineering principle - 'The K.I.S.S. Principle'. Especially of you
are using 1/4in material.

Even a half-dozen sheets are only about the thickness of a standard door.
It's only a few minutes work to mark and lay them down, 'stair-step'
fashion, across a couple of heavy-duty sawhorses {I have a self-made pair
with '2x6' top beams}. You can even adjust to the 'rate of angle' you
prefer - 12-to-1 being preferred for thinner goods. Clamp them together,
with a caul, setting the forward edge flush with the forward edge of the
horse's top beam, and go at it with a plane. A decent, SHARP, Jack of about
9 to 10 inches does nicely. {I have a handy, 'straight-line' belt sander and
just got an electric planer, but so far haven't had to resort to Glenn's
method}. Maybe 15 minutes of comfortable work {ever held a router or
circular saw up at an angel, free-hand . . . even not running ??}gets the
job done. I may even give a few swipes with some course sandpaper on a
block, just to give the mating surfaces some 'bite'.

Regards,
Ron Magen
Backyard Boatshop

"Mark" wrote in message
...
I am building an Arch davis design Penobscot 14 and I am at the point
to scarf plywood for the panels. I am hoping there is a jig design to
cut the scarfs on 1/4" plywood. I have seen jig for circular saws,
but I hoping there is a system to use with a laminate trimmer or a
router for cleaner cuts. Any help would be greatly appreciated.