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MEASUREMENT OF SURFACE FINISH MEASUREMENT OF SURFACE FINISH

MEASUREMENT OF SURFACE FINISH - PowerPoint Presentation

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Uploaded On 2015-09-24

MEASUREMENT OF SURFACE FINISH - PPT Presentation

SURFACE TEXTURE The characteristics quality of an actual surface due to small departures from its general geometrical form which occurring at regular or irregular intervals tend to form a pattern or texture on the surface ID: 138609

amp surface lec texture surface amp texture lec 2012 finish numerical evaluation regular rms cla irregularity readily popular surfacethe

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Slide1

MEASUREMENT OF SURFACE FINISH

SURFACE TEXTURE:“ The characteristics quality of an actual surface due to small departures from its general geometrical form which, occurring at regular or irregular intervals, tend to form a pattern or texture on the surface”

24/03/2012

1

Lec # 27 & 28Slide2

1. SURFACE TEXTURE

“The General form” relates to the dominant shape of surface which it is intended to reproduce, & constitute a first approximation to the design formIt is possible for two or more kind of irregularity to be combined in the complete texture of a surface in such a way that they are not readily distinguishable individually by eye or touch

Surface texture varies according to the machining processes used in producing it (eg. Metal machining)

24/03/2012

2

Lec # 27 & 28Slide3

1. SURFACE TEXTURE

Difference in surface texture are apparent by visual examination & can be felt readily by passing a finger nail over the surfaceThe texture of surfaces can be regular or non-regular in characterFACTORS PRODUCING SURFACE IRREGULARITY:Faulty toolsInherent imperfections in the m/c tools

Errors due to personal element

24/03/2012

3

Lec # 27 & 28Slide4

2. METHODS OF MEASURING S. FINISH

SURFACE INSPECTION BY COMPARISON MEHODS: these include:Touch inspection

Visual inspectionScratch inspection

Microscopic inspectioon

Surface photographs

Micro

interferromter

Wallace surface dynamometer

Reflected light intensity

Comparison by standard specimens

24/03/2012

4

Lec # 27 & 28Slide5

2. METHODS OF MEASURING S. FINISH

Direct Instrument MeasurementIntersection method Interference methodStylus method

24/03/2012

5

Lec # 27 & 28Slide6

3. NUMERICAL EVALUATION OF SURFACE

TEXTUREPractice adopted for obtaining numerical evaluation of surface texture is to use a parameter based on the cross-sectional profile of the surface under examinationThere are two system for Numerical evaluation of surface finish, i.e

:Centre line average (CLA)

Root mean square (RMS) value of height undulations of the surfaceThe CLA system is more popular in UK, while the RMS is more popular in USA

24/03/2012

6

Lec # 27 & 28Slide7

3. NUMERICAL EVALUATION OF SURFACE

TEXTUREFOR EQUATIONS of CLA & RMS, AS DEOMOSNTRATED ON BOARD

24/03/2012

7

Lec # 27 & 28Slide8

4. TOMLINSON SURFACE FINISH

RECORDERAs Demonstrated for figure on next slide on board24/03/2012

8

Lec # 27 & 28Slide9

4. TOMLINSON SURFACE FINISH

RECORDER24/03/2012

9

Lec # 27 & 28Slide10

5. ADVERSE EFFECTS OF POOR SURFACE FINISH

Book: Engineering metrology & instrumentationPage#: 234DO YOUR SELF

24/03/2012

Lec # 27 & 28

10