Built-Up Edge: Adhered Work Material Is Different from Missing Tool Material

Identify material addition

Harvey describes built-up edge as workpiece material adhering at the cutting tool. Its presence differs from removal of the tool substrate. Primary reference: Harvey technical explanation.

Read fictional before-and-after profiles

Imagine an original edge profile retained in a calibrated section image. A later observation shows a local feature protruding 0.03 mm above that original envelope. A subsequent examination identifies the feature as attached workpiece material.

Another location is 0.02 mm inside the original profile and independently identified as missing substrate. Reporting their net difference as only 0.01 mm of wear would hide two different observations. The invented offsets are not a tool-life limit or a real inspection; they illustrate why deposit and loss should retain separate identities.

Keep evidence with each mechanism

Preserve the original shape, image direction and means used to identify the material. Record deposits and missing regions separately when they coexist. If a deposit later detaches, inspect whether the substrate profile also changed rather than assuming detachment restored the original edge.

A surface photograph alone may leave composition or depth unresolved. Ask which evidence distinguishes added work material from lost tool material before changing a process setting. This worksheet makes that distinction explicit without assigning a cause to every rough surface or selecting a universal remedy.

Customer Questions

Primary References

These references support the technical principles discussed in this guide. The worked examples and review questions are educational.

• Primary reference: Harvey technical explanation