Introduction:
Contain degree of surface finish is required for the proper functioning of the working surface.
Types of surface finish:
Nominal surface
Rough surface
Wavy surface
Elements of surface texture:
Surface roughness
Profile
Flaw, Law, Waviness
Cut off length
Datum of surface finish measurement:
The M system (The mean line system)
The E system (The envelope system)
Numerical value for surface finish:
1. Peak –to- valley height
2. The depth of smoothness
3. The mean depth
4. Centre line average
5. Room mean square.
6.
Methods of measuring surface finish:
Visual inspection
Touch method
Scratch method
Comparative or qualitative methods of surface finish measurement:
Direct methods:
Stylus probe instrument
Tomlinson surface meter
Taylor Hobson”Talysurf”
Profilometer
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