Interesting riser near the moving jaw. What stops the gate freezing before the jaw has cooled? It looks too narrow.
That I don't know. For the 'artistic' cast iron we are doing around here, the bound sand is tan and the mold wash is black. The stuff like locators, gluing the halves shut, and covers over the openings until pouring (then pour through) is familiar. Sometimes metal pallet banding with corners and wedges are used instead of weights.
I believe the key is the volume of the two risers. The one gated into the moveable jaw is larger than the one gated into the beam. They both get the hottest metal from the pour and stay fluid longer than the casting.
That vise turned out to be much bigger than it looked at first! Maybe the gate was bigger than it looked too. This was about the best view of it I noticed (cropped from a screenshot). The little V's of sand on either side of the thinnest point in the gate must get really hot, maybe that helps? Jeff
Good job on the screenshot Jeff. I fumbled around for a few minutes on my iPad to get a good view and gave up. I’ll bet the area around the gate stays good and hot just from the sheer volume of metal around it. Pete
they used exothermic riser sleeves in the mold , basically the riser is wrapped with Thermite imbedded in cellulose, the riser will increase in temperature when the molten metal gets into it lighting the thermite, then the sleeve also acts as insulation keeping the metal molten longer, it can easily double the efficiency of risers V/r HT1
