Irregular shallow round or angular grooves that appear on the surface of the casting
Indicates that the ceramic shell was built around a defective wax pattern
Causes of this defect are evident in the wax portion of the process; to cure, R&R recommends taking the following actions:
Excessive die lubricant, low injection pressure, cold wax, cold die, or poor flow rate.
Adjust the wax parameters to eliminate flow lines, temperature, pressure and flow rate.