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What is Surface Finish and Types of Surface Finish Parameters

What is Surface Finish / Surface Texture?

The Surface finish also known as surface texture or surface topography is the nature of a surface. It comprises the small local deviations of a surface from the perfectly flat ideal (a true plane).

 

Surface Finish / Surface Texture

Surface Finish/Surface Texture

The surface of every component has some form of texture which varies according to its structure and the way it has been manufactured.

In order to control the manufacturing process or predict a component’s behaviour during use, it is necessary to quantify surface characteristics by using surface finish parameters.

Surface texture parameters or surface finish parameters can be separated into three basic types:

  • Roughness
  • Waviness
  • Form

What are the Types of Surface Finish Parameters?

Surface texture parameters or surface finish parameters can be separated into three basic types:

Surface Finish Parameters Symbols
Amplitude parameters Ra, Rq, Wa, Wq, Pa, Pq
Rv, Rp, Rt, Wv, Wp, Wt, Pv, Pp, Pt
Rsk, Rku, Wsk, Wku, Psk, Pku
Rz (JIS), Pz (JIS)
Rz, Wz, Pz, Rz1max
R3z, R3y (R3z1max)
Spacing parameters RSm, WSm, PSm
RHSC RPc
Hybrid parameters R∆q, W∆q, P∆q, Rλq, Wλq, Pλq
Material Ratio Rmr(c), Rmr, RSc
Rpk, Rk, Rvk, Mr1, Mr2

Surface Roughness Tester


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