Was trying to get a casting session in this morning of some fine silver neck charms. Everything was going well the flask was burned out clean over night and I transferred it to a small oven on the casting bench to keep it hot while I torch melted some silver. So I pulled the flask and set it on the vacuum table, switched on the pump and went to pour... As soon as the molten metal entered the flask I heard it!! Swoosh gurgle gurgle OH Frack !! GRRR... thats just how it goes some days.....
I was using up some old investment and had mixed it a little thin. (Investment powder goes bad and will set up really fast on you) The second factor was i did not have the flask completely full of the investment so there was about a 1/4" gap from being completely full. That gap was between the investment and the table when the vacuum was pulled. When I poured the silver it sealed up the flask and then the bottom portion of the investment got sucked out of the flask... That will teach me not to rush things...
