surface fini

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MEASUREMENT OF SURFACE FINISH:

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 & 28

1. SURFACE TEXTURE:

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 form It 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 & 28

1. SURFACE TEXTURE:

1. SURFACE TEXTURE Difference in surface texture are apparent by visual examination & can be felt readily by passing a finger nail over the surface The texture of surfaces can be regular or non-regular in character FACTORS PRODUCING SURFACE IRREGULARITY: Faulty tools Inherent imperfections in the m/c tools Errors due to personal element 24/03/2012 3 Lec # 27 & 28

2. METHODS OF MEASURING S. FINISH:

2. METHODS OF MEASURING S. FINISH SURFACE INSPECTION BY COMPARISON MEHODS: these include: Touch inspection Visual inspection Scratch inspection Microscopic inspectioon Surface photographs Micro interferromter Wallace surface dynamometer Reflected light intensity Comparison by standard specimens 24/03/2012 4 Lec # 27 & 28

2. METHODS OF MEASURING S. FINISH:

2. METHODS OF MEASURING S. FINISH Direct Instrument Measurement Intersection method Interference method Stylus method 24/03/2012 5 Lec # 27 & 28

Slide 6:

These methods enable to determine a numerical value of the surface finish of any surface. Almost all instruments used are stylus probe type of instruments . These operate on electrical principles . In first type, they operate on the carrier-modulating principle. The movements of the stylus exploring the surface are caused to modulate a high frequency carrier current . The second type includes those operating on voltage-generating principle. In these the movements of the stylus are caused to generate a voltage signal. 24/03/2012 Lec # 27 & 28 6

Slide 7:

These output has to be amplified and the amplified output is used to operate a recording or indicating instrument . First type advantage that the signal fed to the recorder depends only upon the position of the stylus . Second type , when the oscillatory movement of the stylus stops, the output falls to zero no matter where the stylus may be. Stylus Probe Instruments: skid or shoe The Tomlinson Surface Meter. The Taylor-Hobson Talysurf . 24/03/2012 Lec # 27 & 28 7

Slide 8:

24/03/2012 Lec # 27 & 28 8

4. TOMLINSON SURFACE FINISH RECORDER:

4. TOMLINSON SURFACE FINISH RECORDER 24/03/2012 9 Lec # 27 & 28

TOMLINSON SURFACE FINISH:

TOMLINSON SURFACE FINISH 24/03/2012 Lec # 27 & 28 10

Schematic Layout of Talysurf:

Schematic Layout of Talysurf 24/03/2012 Lec # 27 & 28 11

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