B - Operations – Transporting – 23 – H
Patent
B - Operations, Transporting
23
H
B23H 7/38 (2006.01) B23K 26/18 (2006.01) F15B 15/28 (2006.01)
Patent
CA 2639466
A method of providing a machine readable marking on a substrate being a part of an actuator is described, in which the marking includes at least first and second marks, and the method including repeatedly firing a laser device so that at each of a plurality of row positions of a first area of the substrate, substrate material is heated and displaced thus to provide a depression in the surface of the substrate at least partially surrounded by displaced material, the method including providing a plurality of rows of such depressions in the first area to form the first mark, repeatedly firing a laser device so that at each of a plurality of row positions of a second area of the substrate, substrate material is heated and displaced thus to provide a depression in the surface of the substrate at least partially surrounded by displaced material, the method including providing a plurality of rows of such depressions in the second area to form the second mark, and wherein each depression of the rows of depressions of the first and second marks has a depth determined from the general surface of the substrate less than 4µm, and the height of the displaced material determined from the general surface of the substrate is not greater than 4µm.
Griffiths Jonathan Edward
Lightfoot Paul Thomas
Wood William Andrew Care
Borden Ladner Gervais Llp
J.c. Bamford Excavators Limited
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