Having taught foundry in higher education let me make a recommendation. Always use a 4X8 sheet of plywood or OSB on the floor where you will be pouring. Spills happen all too often and not only will you damage the concrete floor, but worse yet you can have small pieces of concrete flying through the air. The expansion of liquid H2O to steam is right around 1200 to 1 and concrete always retains water. Those small pieces of concrete will leave a mark at minimum. This is also the reason to pre-heat your scrap before introducing it to the melt. Just sit it next to the hole in the center of the furnace lid for 15 minutes and it will get plenty warm enough to drive out any trapped liquids. Excellent procedure to follow especially when using items such as transmission casings, small engine blocks, etc as a source of material. BTW, if you know of an engine rebuilder in your area pistons and connecting rods are some of the best sources of material you'll find. Very high quality aluminum. You don't even need to remove the rings or connecting rod pins. Just use a long hook to remove them from the melt prior to the pour.
One more thing, very good use of a grinder balancing rig to balance the disk.
Excellent looking disk sander. I'm sure you'll get plenty of good use from it working both wood & metal, or make two. One for wood & one for metal. Or two disks, one for wood & one for metal. Just drill & tap the center for a jack screw to make removal easier.
When I change out the sanding disks I use adhesive backed disks AND spray the disk with adhesive. Otherwise I usually have trouble getting them to adhere as well as I'd like.
One more thing, very good use of a grinder balancing rig to balance the disk.
Excellent looking disk sander. I'm sure you'll get plenty of good use from it working both wood & metal, or make two. One for wood & one for metal. Or two disks, one for wood & one for metal. Just drill & tap the center for a jack screw to make removal easier.
When I change out the sanding disks I use adhesive backed disks AND spray the disk with adhesive. Otherwise I usually have trouble getting them to adhere as well as I'd like.