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A mark saying which way the machining marks must run.
Also known as: Machining lay marking, Surface direction symbol
A small symbol beside the surface texture tick specifies the lay — the direction of the dominant machining marks. It matters for sealing faces and for wear, where scratches running across a seal leak and scratches running along it do not.
Specifies the direction of the predominant surface pattern left by machining, using a small directional symbol beside the texture mark.
Contexts: Technical drawing
Matters functionally rather than cosmetically: on a sealing face the direction of the machining marks determines whether the joint leaks.
Contexts: Technical drawing
A short mark of parallel lines, crossing lines, a small circle or a letter, set at the foot of the texture tick.