Slicing an 8.5" diameter by 1.5" thick disc into two discs 0.75" thick?
You will need a bandsaw with a capacity of at least 8.5"; I would get one with a capacity of around 12" diameter.
Then get a piece of pipe or tube with and ID a bit larger than 8.5" and long enough to hold securely in the vise on the bandsaw.
Drill and tap three holes 3/8"-16 centered about 0.8 from the end of the tube and screw in some caps screws so the thread sticks inside the tube to a diameter less than 8.5".
Drill and tap another three holes 3/8"16 centered about 3/8" from the end of the tube and put setscrews in these holes.
Put your disc in the tube up against the capscrews that go right through and tighten the three setscrews to hold it in place.
Put the tube in the saw lined up for cutting the disc.
Cut the first disc then without moving the tube put in the next and repeat for however many you need to cut.
For smaller diameters use longer cap screws and setscrews or make a fixture using a smaller tube.
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