I've found that when it comes to large glue-ups such as wall systems, shelf systems, drawer web frames, even smaller cabinet carcases, it helps a great deal if two of the pieces are already set and firm at right angles. Really, it doesn't matter which two pieces are "preglued" before the entire carcase is glued-up, for the fact is, having a built-in "framing square" makes the final assembly so much the easier. Pictured here an actual framing square is clamped to the side of a shelf unit to the keep a shelf square in its dado joint, though the concept would work with biscuits, dowels, or most any other type of joinery. The bench clamp holds a stiffening stick to prevent any inaccuracies due to measuring square off a concave or convex surface. Once the glue is set, this pair of pieces will make the larger glue-up much less unwieldy.
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