A worked example
150 × 210 mm boards, 20 mm spine, 7 mm joints and 15 mm turn-ins produce 364 × 240 mm.
Calculate a flat case cover with two boards, a spine and turn-ins.
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Width = 2 × board width + spine + 2 × joint + 2 × turn-in. Height = board height + 2 × turn-in.
150 × 210 mm boards, 20 mm spine, 7 mm joints and 15 mm turn-ins produce 364 × 240 mm.
A simple rectangular case plan. Board thickness and hinge clearance need a test fit.
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