| 摘要 |
Methods, apparatus, and products are provided in which a three-plane joint is fabricated by double-grooving and then cross-grooving a sheet to define multiple sections, removing at least one of the sections, and then folding the remaining sections together. Where a corner void (22) is created, the void (22) is preferably completed according to any of three classes of methods. In a first class of methods, a substantially triangular center block (24) is inserted into the corner void (22). In a second class of methods, the void (22) is enlarged and the enlarged void is completed with filler pieces (42). In a third class of methods, the corner void (22) and portions of several of the remaining pieces are cut away, and a filler piece (42) is placed across the cut. In other embodiments, the corner void (22) is completely eliminated by folding some of the sections together prior to cross-grooving.
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