Experience needed regarding FW Beater and Armor

[overkill]

Here is a hub and disk arrangement using your dimensions from a few days ago. Its a pretty standard set-up with an extra pulley. The advantages are that the bearing is fully encased in aluminium so it can't bend or distort. Impact forces are transmitted from the disk through the hub without involving the screws, so they can be smaller.





It may look complicated, but the individual parts are fairly easy to make and only need a small lathe - I made a larger version of this on a tiny Sieg C4 model. I picked an 80mm diameter for the pulleys based on a 2:1 reduction as you can definitely get away with a lower deduction with two motors. I went with a 20mm axle as its completely encased in the hub & bearing - it would be best if the mounts are as close as possible to the disk to avoid any bending.

Edit: just noticed that I had to increase the pulley diameter to 90mm so the pulley groove and the screws didn't intersect. One idea to reduce the pulley diameter and width is to change to a micro-V pulley. A 'J' sized micro-V (also called multi ribbed) belt is only 3.8mm thick and would get the pulley diameter down to 80mm or less. With two belts you could use a very narrow 4 rib belt to make the pulleys narrower.