Just a quick post to show the failed aluminium lost foam castings that I'd attempted on Monday. I have some big ball bearings bought for cheap at an auction that I'm going to use for a plough disc bowl sand mixer. The plan is to have the inner rotating tube bolted to the horizontal plough disc and should give a three inch hole to empty the sand into a bucket below. So the bearings are angular contact 7300 series with 190mm O.D. and 90mm bore. So for both pours I was downwind of the fireball and had to interrupt the pours twice to shift out of the flames. The runner was coated in plaster of paris and worked quite well, it's long to allow plenty of sand weight on top. Ran out of metal on the second pour after interrupting pour twice.