A wear measurement needs a tool-face location and a defined dimension.
Locate the worn face
NPTEL distinguishes flank wear beside the generated surface from crater wear on the chip-contact rake face, and describes different measurement quantities. Primary reference: NPTEL machining lesson.
Compare fictional inspection records
Imagine inspection A reports a flank wear-land width of 0.10 mm. Inspection B reports crater depth of 0.04 mm on the rake face. Dividing the numbers gives 2.5, but that ratio cannot establish that A has 2.5 times the damage.
The dimensions describe different geometric objects and measurement directions. A third inspection using crater width rather than depth changes the question again. These invented records demonstrate a reporting mismatch; they are not observed tool damage, allowable wear limits or a life criterion.
Make the inspection traceable
Keep an annotated image showing the edge, rake face, flank and location of every measured feature. Name width, depth or area explicitly and retain the method and section direction.
Compare the same quantity over time before claiming a growth trend. Geometry alone also does not uniquely identify the physical cause; abrasive, chemical and mechanical effects may require additional evidence. This worksheet helps a maintenance or machining reviewer decide whether two inspection reports describe comparable wear, rather than ranking dissimilar numbers simply because both were quoted in millimeters.
Customer Questions
Is a width/depth ratio a damage ratio?
It compares different geometric quantities.
Where is the crater described?
On the chip-contact rake face.
Does location alone prove a wear mechanism?
Additional physical evidence is needed.
Primary References
These references support the technical principles discussed in this guide. The worked examples and review questions are educational.
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