Atlas of Wax Pattern Defects
Positive
Sharp, thin fin of wax along soluble or core surface.
Varies
Always at parting lines or interface of cavity and features created by slides.
Visual inspection
Wax, under the forces of injection pressure, unintentionally enters thin gaps around core or soluble.
| Area | Possible Cause | Potential Correction |
|---|---|---|
| Equipment | High injection pressure |
Decrease injection pressure |
| Equipment | High wax flow rate |
Reduce wax flow rate |
| Equipment | High acceleration rate (Machines equipped with electronic injection control) |
Reduce acceleration rate |
| Equipment | High wax temperature |
Reduce wax temperature. |
| Pattern Die | High die temperature |
Reduce die temperature |
| Pattern Die | Die worn or damaged |
Correct wear or damage to die. Replace if problem is severe. |
| Core | Undersized core |
Check dimensions and correct accordingly |
| Core | Damaged or broken core |
Determine cause for failure and correct accordingly |