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2D Code on Cast Surfaces

Marking on cast surfaces is a challenge. The roughness of the cast surface will "hide" regular alpha characters. Standard Dot-Peen 2D codes become impossible to read as the single dots for each cell blend into the cast surface background. CMT's Square-Dot® is a patented high resolution marking process to apply 2D/UID machine readable codes to a variety of materials. This process scribes a matrix of small square cells into the material. The mark provides  the best direct part reading with a vision system as the cells are filled in similar to a  laser mark but much deeper and often with better contrast.

The following is a study of Square-Dot® 2D marks into a range of cast surfaces. Cast surfaces are measured by AA (English) and Ra (Metric). Each cast surface rating is provided in English and Metric units. The first five 2D matrix marks and 3/8" x 3/8" square. The last two 2D matrix marks, in the roughest surfaces, are 1/2" x 1/2" square. On the Left is a picture of the mark on the right is the camera reading.

32µ" AA / Ra 0.8µm

63µ" AA / Ra 0.8µm
125µ" AA / Ra 0.8µm
250µ" AA / Ra 0.8µm
500µ" AA / Ra 0.8µm
1000µ" AA / Ra 0.8µm
2000µ" AA / Ra 0.8µm

“..and all other dot peen markers imprint a round dot; whereas a laser marker is capable of marking a square cell. This adds to the relative readability of laser marks in 2-D applications, since a theoretically perfect Data Matrix® 2-D code is based on square cells.”
-Dot-Peen Manufacturer