How to make a picture frame?

Question

I have a 48 inch X 45 inch piece of 3/4 inch plywood that I want to add a moulding all the way around so that it is framed. I have moulding that is 90 degrees and measures 3/4 X 3/4. I have tried almost everything and I cannot for the life of me find the angles that I need to make the corners fit perfectly and at the same time fit flush on the face of the plywood. Any help is greatly appreciated.

Answer 1

Have you tried using a miter box?  The other thing to consider:  Is your plywood truly square?  That will affect how the molding fits together.