Yes, you are correct in theory. However the physics of the matter are
against you doing an accurate job without a fence that will adjust to the 69
degrees. If you try to do it with out a fence that can be set and locked at
69 degrees you are faced with lining up both the depth from the reference
surface and how parallel it is from the reference edge strictly by eye then
holding it steady on that precise plane against the torque of the motor and
the tendency of the jointer to slip as the blade enters the wood.

--
Mike G.

Heirloom Woods
www.heirloom-woods.net
"Pefferie" wrote in message
om...
Why is it that I would have to have a biscuits jointer that is
adjustable to the irregular angles? I guess I am missing something
here and I have never used a biscuit jointer - but - if mitered planks
join at, say, 138 degrees, their edges are cut at 138/2 = 69 degrees,
the biscuit should still be inserted perpendicular to the miter cut on
both sides, shouldn't it?
iouri

"Mike G" wrote in message
...
For the best appearance the ends of the border should be mitered.
I'd
probably use FF biscuits but you have to have a biscuits jointer
that is
adjustable to the irregular angles. Splines would work well as will
dowels
if you can drill the holes at the proper angle. A lot depends on
what
tools
you have to work with and how good you are with them.