Surface Texture and Inspection

Provided by: ToolingU

The surface finish achieved by a machining process determines how well a surface performs its given function. Surface inspection compares the specified nominal surface and real surface to find the measured surface. Measurement can be completed by comparison, direct measurement with a stylus-type instrument, or noncontact methods. A real surface contains irregularities (flaws, roughness, waviness, and lay) that make up its surface texture. Roughness is the most common irregularity used to inspect surfaces. The desired finish of a surface changes how precisely a part must be machined. Inspecting for surface roughness reduces the cost of surface finish by allowing companies to produce parts to customer specifications. After the class, users should be able to describe commonly used methods for tolerancing a part's surface roughness in a production environment.

Course Objectives:

  • Explain surface finish and how it affects a part's function
  • Distinguish between a static and dynamic surface
  • Describe how machining processes cause surface finish
  • Define surface texture. Distinguish between the actual surface and its specifications
  • Identify flaws
  • Identify lay
  • Identify roughness
  • Define average roughnes
  • Identify waviness
  • Identify the methods used to measure roughness
  • Describe surface replica blocks and the fingernail test
  • Describe how a stylus-type device measures roughness
  • Explain the method for mastering surface measuring instruments
  • Describe how surface finish affects cost.

Recommended Background

  • Recommended for manufacturing personnel, particularly for the quality control and inspection department.

Course ID


Skill Focus

Smart Business



Employee Type

New Applicants,1st level Supervisors, Operations teams

Method of Delivery


Estimated Effort

3 hrs



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