Glue the blocks to the plywood strips and when dry, clamp the frame corners as shown.
-- John Tanzini, Hamilton Square, N.J.
I've made several of these. They work fantastic. Tightens them miters right up. The beauty of these is that you can clamp the jigs to the frame pieces before even applying glue to the miter surfaces. Once glued then its just a matter of adding the last clamp to hold the pieces together. As an add on tip to what john880 wrote... pieces of an old worn sanding belt from a belt sander work great for the adding to the contact surfaces.
I wish I could have used this concept when I made some tri-angle shaped flag cases. The angles would have had to be different but the same concept could be used.
The 45* blocks need to be as long as the joint or the clamps will compress only the outer part of the joint and allow the inner to separate. Don't ask me how I know this...
I've made something similar to these and they work pretty well.
Wish I would have seen this a week ago. Will have to make a bunch. Looks like they'd be the cat's meow~!!
Glue a fine grain sand papper, THAT HAS, a good backing. To the 1/4" base that has the contact with the piece.~~ Far better grip on you jig !!!
Haven't tried it but it looks like it will work C.
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