surface texture symbols chapter 12 instructor: m.yaqub
TRANSCRIPT
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Surface Texture Symbols
CHAPTER 12
INSTRUCTOR: M.YAQUB
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12.22 Surface Roughness, Waviness, and Lay
• The modern demands of the automobile, the airplane, and other modern machines (heavier loads, higher speeds with less friction) need for accurate control of surface.
• The system of surface texture symbols recommended by ANSI/ASME.
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Surface Texture Symbols
• Not all surfaces can be finished because of cost constrains. Few surfaces requires special surface finish and should indicate on drawing by using surface finish symbol.
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DefinationsRoughness CLA or Roughness height (Ra)
Average of roughness height over a certain length Roughness-width Cut off The length over which roughness is average
Roughness Width: Horizontal distance between two similar point
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Waviness Width: Overall widthWaviness Height: Overall height Lay Direction: Mark of machining on surface
Flaw: Defect on material surface
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Surface texture symbol
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Additional Information
• Usually all information are not required. Only roughness height and machine allowance is important. In this case basic symbol is used.
• Roughness height in m or in inch. All other in mm or inch.
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Example
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