The Need for DPM (Direct Part Marking) Verification


  • Marking processes drift from nominal settings ultimately leading to unreadable marks

  • Verification is a metrology tool to ensure consistent mark quality

  • Verifier can tell not only that mark is readable but also how close it is to edge of readability

  • Analogy: Inspection vs. SPC (Statistical Process Control)

  • Verification allows adjusting marking process before bad marks are made
            

Examples of Direct Part Marking Problems
Examples of Direct Part Marking Problems

Evaluation of Direct Part Mark Quality
Evaluation of
Mark Quality

Why Verify?


Because all marking systems degrade over time.

Mark Quality Over Time Using a Reader
to Check Mark Quality

Direct Part Mark Quality Over Time with Reader

 
Mark Quality Over Time Using a Verifier
to Check Mark Quality

Direct Part Mark Quality Over Time with Verifier

Without verification, some "bad" parts
escape into the process.
  With verification, we prevent bad marks
from ever being made.