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Lamination Length and Mitre-Angle Tolerances for Step-Lap Joints
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Step-lap joints need controlled offsets between mating layers. This video explains how end dimensions and a repeated mitre-angle error can change the overlap and open a wedge-shaped gap. Setup checks, fixed stacking guides and retained first-article and process records link individual sheet tolerances to the assembled joint.
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A correct sheet can still form an incorrect joint. Step lap needs a controlled offset between layers. Errors at both mating ends change that overlap. Consider the article's geometric example. A four hundred millimetre wide sheet has a forty five degree joint about five hundred sixty six millimetres long. With one end aligned, a zero point one degree mismatch opens a wedge reaching about one millimetre. This is a calculation, not a measured production result. A systematic angle error repeats through the run. Verify angle at setup and during production. Measure length, use fixed stacking guides, and retain first article and process records. Specify tolerances for the assembled joint, not only individual sheets.