Name:
Period:
Date:
Inspection Scenario
A CNC process produces aluminum mounting blocks. The specified width is 25.00 mm ± 0.20 mm. Acceptable parts must measure from 24.80 mm through 25.20 mm.
| Part | Measured width (mm) | Accept or reject? | Deviation from 25.00 mm |
|---|---|---|---|
| 1 | 24.96 | ||
| 2 | 25.04 | ||
| 3 | 25.17 | ||
| 4 | 25.23 | ||
| 5 | 25.21 | ||
| 6 | 25.28 | ||
| 7 | 25.31 | ||
| 8 | 25.26 | ||
| 9 | 25.19 | ||
| 10 | 25.14 | ||
| 11 | 25.09 | ||
| 12 | 25.05 |
1. Inspect the Batch
- Complete the acceptance and deviation columns.
- How many parts are accepted?
- What percentage of the batch is rejected?
2. Identify the Pattern
- Are the rejected values randomly high and low, or do they show a direction?
- At what part number does the process appear to move out of tolerance?
- Does the process later move back toward the target?
3. Diagnose Possible Causes
Rank the following possible causes from most to least likely and explain your top choice:
- Tool wear
- Incorrect initial program dimension
- Loose fixture
- Temperature change
- Measurement error
4. Corrective Action Plan
Describe what the operator should do immediately, what should be inspected, and how the process should be verified before production resumes.
5. Quality Report
Write a four-sentence report summarizing the specification, findings, likely cause, and recommended action.
Submission Checklist
- All analysis questions are answered.
- Required calculations, tables, sketches, or diagrams are complete.
- The final recommendation uses evidence from the lesson.
- Your name, class period, and date are included.
Closing Reflection
What was the most important engineering or manufacturing decision you made in this lesson? Explain why it mattered.