How far out to place motor from platter

note that your speed may change based on how tight the belt is, either due to belt stretch changing the diameter or excess loading on the motor bearing increasing friction. Obviously, both motors should be the same distance away from the platter.

John,
Stretching the belt necessarily make it thinner, and therefore, the radius of each pulley changes as the ratio is determined by the radius to the center of the belt at each end. And thats assuming that the increased drag from the side loading of the motor and platter bearing doesnt also slow the platter down. I know on my Transrotor Fat Bob, I can hear it slow down as I pull the motor farther away. There is a point of perfect tension, and it is different on each table/motor/platter/belt