BS 1134 SURFACE FINISH PDF

Ensure use of the most current version of this document by searching British Standards Online at bsonline. General 1 Scope 1 2 Definitions 1 Section 2. Determination of surface roughness 3 Sampling lengths 12 4 Graphical determination of parameter values 12 5 Statements of surface roughness 16 Section 3. BSI i , August 03, , Uncontrolled Copy, BS Page Table 7 — Preferred nominal values for ten point height of irregularities Rz , and maximum height of the profile Ry 23 Table 8 — Preferred nominal values for mean spacing of profile irregularities Sm , and mean spacing of local peaks of the profile S 24 Table 9 — Comparison of Ra values obtained by graphical and instrumental means 24 Publications referred to Inside back cover Licensed Copy: Anthony Babb, ii? BS and BS are accordingly withdrawn.

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Relevant Standards.. BS Title: Assessment of surface texture. Surface texture. Profile method. Terms, definitions and surface texture parameters BS EN ISO Geometrical product specifications - Surface texture: profile method - Rules and procedures for assessment of surface texture.

Indication of surface texture in technical product documentation Surface Finish Notes Surface Texture The accurate characterization of surface texture has become increasingly important in the instrument, computing, data storage, automotive and biomedical industries.

Surface texture is a key consideration affecting the function and reliability engineering components. The surface texture is the local deviations of a surface from its ideal shape e. The measure of the surface texture is generally determined in terms of its roughness, waviness and Form.

Roughness The roughness of a manufactured surface generally results from the production process and not specifically from the machining process if any. The action of the cutting tool, chemical action, polishing, lapping, and the structure of the material all contribute to the roughness of the surface. Waviness Waviness, the more widely spaced repetitive deviations, usually relate to the characteristics of an individual machine or to external environmental factors.

It may result from such factors as machine or work deflection, vibration, chatter, heat treatment, or warping strains. Because both process and machine induced irregularities occur simultaneously,roughness is superimposed over waviness. Form The form of a surface is the profile of the surface under consideration ignoring variations due to roughness and waviness. Deviations from the desired form result from clamping marks or sliding marks machining guide errors etc.

Measuring Surface Finish In the past surface texture has been assessed by the judgment of the inspector either by eye or even fingernail. The evaluation was done by comparing the surface to be measured with standard surfaces A modern typical surface measuring instrument will consist of a stylus with a small tip diamond a gauge or transducer, a traverse datum and a processor.

The surface is measured by moving the stylus across the surface. As the stylus moves up and down along the surface, the transducer converts this movement into a signal which is then exported to a processor which converts this into a number and usually a visual profile. On the normal portable units the guide is generally based on a skid which slides over the general surface ensuring that the linked stylus moves in a straight line parallel to the local surface Surface Texture Parameters The identification of the surface texture used a number of parameters.

These are different depending on the standard used and on the issue of the relevant standard. The notes below relate to the standards as listed above R a - Average Roughness The total roughness, R t R y , is the sum of these two, or the vertical distance from the deepest valley to the highest peak.

R z is the sum of the height of the highest peak plus the lowest valley depth within a sampling length lr. The instruments measure the roughness variations and the waviness variations.

Selecting a roughness filter will remove waviness elements, leaving the roughness profile for evaluation. Selecting a waviness filter will remove roughness elements,leaving the waviness profile for evaluation. The signal filters operate on the digital information. Separating the roughness and waviness is achieved by using filter cut-offs. In the roughness requirement this value is the sampling length. Sites Providing Information on surface Finish..

A link to further information on Surface Texture.

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BS 1134 SURFACE FINISH EPUB

Relevant Standards.. BS Title: Assessment of surface texture. Surface texture. Profile method. Terms, definitions and surface texture parameters BS EN ISO Geometrical product specifications - Surface texture: profile method - Rules and procedures for assessment of surface texture.

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Akinozshura A link to further information on Surface Texture Taylor Hobson Take the smart route to manage medical device compliance. The measure of the surface texture is generally determined in terms of its roughness, waviness and Form. In the past surface texture has been assessed by the judgment of the bs surface finish either by eye or even fingernail. Selecting a waviness filter will remove roughness elements,leaving the waviness profile for evaluation. We use cookies to make our website easier to use fibish to better understand your needs. The total roughness, R t R yis the sum of these two, or the vertical distance from the deepest valley to the highest peak.

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BS 1134 SURFACE FINISH PDF DOWNLOAD

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