Examples of unacceptable surface finishes

Examples of unacceptable surface finishes - Machining defects

Figure 1: Nick.

Figure 2: Cold working action and scratch (part needs buffed to obtain uniform surface finish).

Figure 3: Nicks.

Figure 4: Nicks and dings on threads.

Figure 5: Gouges on paint.

Figure 6: Gouges on paint.

Defect name: No data.
Record No.: 3161
Type of defect (Internal/Surface): Surface
Defect classification: Machining defects
Steel name: Steel
Steel composition in weight %: No data.
Note: Definitions:
Abrasion: Surface imperfection that doesn’t remove or displace material appears as a scuff or a change to the surface finish.

Buffing: Light polishing with a soft cloth or cloth wheel.

Burnishing: Light material rubbing; burnishing produces a “smoothing” of material and a shiny outer surface. Material removal does not occur.

Burrs: Sharp edges around the part features, often caused by manufacturing processes like punching, shearing, milling or drilling.

Dents and Dings: Any small, measurable depression in a part surface, often produced by striking or pressing the surface.

Impressions: A mark or blemish made by pressure. An impression could be a ding or dent.

Nick: A slight cut, chip, or indentation on a surface or edge.

Polishing: To remove roughness from a surface and make it smooth by rubbing, with or without compound.

Scratches: Lines or marks on a surface, often created by a sharp object. A scratch is defined as a maximum of .003 in. in width, and by nature, a scratch involves the removal or displacement of material.

Surface Imperfections and/or Flaws: Surface interruptions such as cracks, nicks, Dings, Dents, scratches or ridges.

Surface Texture: Describes geometric irregularities of the surface of a solid material.

Swaging: A cold working process for shaping material, where material is forced into a die(s) using continuous, repeated impacts.

Tooling Marks: Any marks that appear on the surface of a part as the result of a manufacturing process, including, but not limited to: depressions, gouges, impressions, clamping marks, etc.
Reference: Not shown in this demonstration version.