Check out how to build a DIY corner TV stand @istandarddesign
If you clamp them to a carpenters square you not only get a true 90 degree angle you leave your hands free to drill the screw into place.
Woodpeckers Clamping Square, Pair
Jig for glueing miter joints- good for picture frames.
These blocks are like a spare pair of hands for assembling drawers and many kinds of cabinets. Make them out of 3⁄4-in. plywood with dadoes the width of your stock. Back to Workshop Tips Index
Clique para redimensionar.
I saw this in "Ken's favorite shop tips" in The Family Handyman April 2014.
ensamblaje grado abrazaderas / abrazaderas
square piece of wood clamped from two angles if you do not have a corner clamp
Plywood squares are a third hand for cabinetmakers - FineWoodworking