01 • Problem
What needed to be solved
Cutting quality deteriorated after maintenance/optics intervention. A wide kerf or poor cut can tempt the team to blame the newest replaced component immediately, but multiple interacting variables can produce similar symptoms.
01Define the requirement
02Collect evidence
03Review / verify
04Execute & confirm
02 • Evidence
Information that materially changes the answer
- Material and thickness
- Nozzle type / diameter
- Focus position
- Lens stack and orientation
- Protective window condition
- Nozzle centering result
- Assist gas and pressure
- Recent maintenance actions
- Machine cleanliness
03 • Engineering review
How the requirement is broken down
- Verify consumables and optical parts are correct and clean.
- Check nozzle condition and centering before changing multiple parameters.
- Confirm the focus reference and head calibration.
- Compare settings with the previously stable condition.
- Record maintenance and contamination evidence to avoid recurring optics damage.
04 • Solution pattern
Practical execution route
The issue is handled as a controlled elimination sequence rather than random parameter changes. Each variable is checked and documented so a confirmed cause can be distinguished from a coincidental recent change.
Engineering takeaway
RCA is not the first plausible story. It is the cause that survives evidence and explains the observed failure mechanism.