Use this route when a run changes or an inspected bore fails a requirement. Its output is an incident record that separates the observation, proposed explanation, approved change and inspected outcome.
Name what changed
Gun-drilling troubleshooting distinguishes size, exit-location, chip-return, fluid and tool observations. Keep the characteristic, location and run identity before choosing the next investigation.
Follow the corresponding evidence
- For repeated exit offsets, use alignment and fixed coordinates.
- For changing chip return, identify the method-specific supply and exhaust path.
- For a fluid-reading discrepancy, compare sensor locations and operating states.
- For a failed inspection, first check the characteristic and report coverage.
These routes organize competing questions. A symptom does not prove one cause or authorize a new setting.
Make the comparison reviewable
Use the incident worksheet to retain the baseline and the actual intervention. Record other changes that prevent a variable from being isolated. A recovered process reading and an accepted part are separate results.
For a case worth sharing, prepare a documented application submission with data ownership and permission. Keep unsuccessful and inconclusive comparisons visible in the source record.