Rule 1 Achieve a good quality melt 1 Rule 2 Avoid turbulent entrainment (the critical velocity requirement) 9 Rule 3 Avoid laminar entrainment of the surface film (the non stopping, non reversing condition 102 Rule 4 Avoid bubble damage 108 Rule 5 Avoid core blows 114 Rule 6 Avoid shrinkage damage 120 Rule 7 Avoid convection damage 157 Rule …