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What is the rule for marking Data Matrix codes on Cylinders

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The printing rule that I mention is from the NASA spec, NASA-STD-6002 (Applying Data Matrix Identification Symbols on Aerospace Parts).  This document can be retrieved from https://standards.nasa.gov/file/517/download?token=yuQmgz3V
Section is the relevant section.  Per the document… Part Geometry
Flat surfaces are preferred over curved surfaces for marking. A rectangular symbol shall be
applied to cylindrical parts, either concave or convex. The rectangle is sized to fit either within the
reflective band of light that emanates from the spine of the curve or on 5 percent of the
circumference. This band of light typically occupies 16 percent of the diameter of the curve under
normal room light and can increase in size under bright light conditions. Figure 3 illustrates the
proper method for marking curved surfaces.

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