if you have a compound Miter saw on a slide this becomes a lot easier
first finger joint two piceses on one side to make a 90
miter the other edges of the two pices that join to make the 90 at 45
miter the last pices at 45 on both sides

then make a jig out of two pices of sheet material(MBF, Plywood, etc) with a
rectangle hole in each with a side parallel to the side oppisete of the 90
the mount the two sides together at a conveniant with apperts MAKE SURE
THERE TRUE TO ONE ANOTHER!
then to cut your 45 finders place the pice 45 degree down and clamp it to
the jig.

hope that makes sense


Ron wrote:

My FIL passed away a couple weeks ago and he has a military funeral.
My MIL was going to buy a flag display case but I told her I'd build
one for her. Seems simple enough but I want to make it as nice as I
can and have been debating on how to make the joints. It's basically a
90-45-45 triangle. I thought about finger joints but I'd have to build
some kind of jig to do the 45deg sides and I'm not sure the best way
to do that. Any ideas will help. If I can't figure out an effective
way to do the finger joints I'll probably just mimic them with spline
joints, but that's also require a jig.