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The figure below shows a symbolic representation of the surface texture in a perpendicular lay orientation with indicative values (I through VI) marking the various specifications whose definitions are listed below. P: Maximum Waviness Height (mm); Q: Maximum Roughness Height (mm); R: Minimum Roughness Height (mm); S: Maximum Waviness Width (mm); T: Maximum Roughness Width (mm); U: Roughness Width Cutoff (mm); The correct match between the specifications and the symbols (I to VI) is

The figure below shows a symbolic representation of the surface texture in a perpendicular lay orientation with indicative values (I through VI) marking the various specifications whose definitions are listed below. P: Maximum Waviness Height (mm); Q: Maximum Roughness Height (mm); R: Minimum Roughness Height (mm); S: Maximum Waviness Width (mm); T: Maximum Roughness Width (mm); U: Roughness Width Cutoff (mm); The correct match between the specifications and the symbols (I to VI) is Correct Answer I-R, II-Q, III-P, IV-S, V-U, VI-T

Surface texture is the degree of finish conveyed to the machinist by a system of symbols devised by a Standards Association. These symbols provide a standard system of determining and indicating the surface finish.

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Surface terms:

Flaws: Flaws are random irregularities or scratches, holes depression, seams, tear, or inclusions. These are defects caused during the machining operation.

Lay: It is the direction of the surface pattern caused by the machining and is visible to the naked eye.

Roughness: Roughness is the irregular deviation of the surface.

Roughness height: Roughness height, Ra is the deviation of the centerline.

Roughness width: Roughness width is the distance between successive roughness peaks parallel to the nominal surface.

Waviness: Waviness is the recurrent deviation form a flat surface, it is measured and described in terms of the surface between adjacent crests of the waves (waviness width) and height between the crests and valleys of the waves (waviness height).

 

Standard symbol to represent surface texture:

Specifications

Marking

Placement of maximum roughness width rating to right of the lay symbol

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Placement of roughness width cut-off

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Placement of maximum value roughness height

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Placement of minimum value of roughness height

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Placement of maximum waviness height and

The maximum waviness width value

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