Atlas of Wax Pattern Defects
Positive
Smooth, round bulging
Varies
Random
N/A
Visual inspection
Air entrained in wax under the force of injection pressure later expands to create a surface bulge
| Area | Possible Cause | Potential Correction |
|---|---|---|
| Equipment | Out of calibration |
See Best Practices Section |
| Equipment | Improper melting and/or conditioning |
Review melting and/or conditioning process |
| Equipment | Hot wax |
Decrease wax temperature |
| Equipment | Excessive wax flow |
Reduce wax flow |
| Equipment | Excessive acceleration rate (Machines equipped with electronic injection control) |
Reduce acceleration rate. If available, recommend using volume-based flow Vs. time-based flow. |
| Equipment | Loose nozzle connection-air entrained during injection |
Tighten nozzle |
| Pattern Die | Improper die venting |
Clean and/or add die vents |