A wise old woodworker once told me the perfect miter was just an
intellectual concept and doesn't exist in the real world. But having said
that, if you still wish to pursue it -
BTW, Google is your friend.
I used to struggle to make good miter joints for picture frames.
Recently I made a miter cutting jig that has worked very well.
I got the design from the Web but unfortunately I didn't save the
It is basically a sled made of MDF or plywood that slides in
the miter gauge slots of my table saw. Two hardwood fences
are bolted to the sled at a right angle so that where they meet
is where the blade cuts into the sled. You adjust the angles of
the fences so that 1) each fence is at a perfect 45 deg. angle
to the blade and 2) the two fences are at a perfect right angle.
Do this with test pieces of scrap similar to what you would
use for a picture frame.
If you can find such a jig on the web you'll see how it works
immediately. It is pretty simple and it makes almost perfect
miters for me. A key: the opposing pieces must be exactly
the same length which you can get by clampling a stop block
to the fence when you make the cut.
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