"Scorp" wrote in message

1" is pretty deep for such a small frame.

My experience is just the opposite ... with frame sides 2.5" wide, it is
hardly worth using "miter with spline" frame joinery with just a 1" spline.

At that width, the mitered surfaces being joined are over 3.5" long.

So, and just an off-the-cuff rough estimate, a triangular shaped spline with
2" height would offer over 4 times more glue area to reinforce the mitered
frame joint, more glue area being the whole point of this joinery method.

I would probably use a spline height of 2.5", which is about right, IME, for
frame joinery with sides of this width ... and it's easy to cut the spline
slot in the frame corners to this depth on the table saw.

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