Using these adjustments, I fixed the motor spacing and fixed the rotational radius. I allowed the top beam to move around (left, right, up, down and tilt) and allowed chain sag and left and right chain tolerances to vary. I restricted the chain tolerances from going higher than 1.0 (in the way I calculate chain tolerance, a number higher than 1.0 suggests the chains are shorter than they should be… which is not logical)
The results are encouraging in that it at least it minimized error value…
Error Magnitude: 0.809
Motor Spacing: 3602.6 (what I measured by hand… this was fixed)
Rotation Radius: 139.1 (what I believe it to be… this was fixed)
Chain Sag Correction: 28.023907
Left Chain: 0.994409
Right Chain: 0.997864
Left Motor X,Y: -1800.6534, -1082.749
Right Motor X,Y: 1801.9455, -1085.525 (this means right motor about 3 mm higher than left)
Left Chain Error Hole 1: -0.985
Left Chain Error Hole 2: 0.9938
Left Chain Error Hole 3: -0.9462
Left Chain Error Hole 4: 0.8875
Right Chain Error Hole 1: -0.7822
Right Chain Error Hole 2: 0.8981
Right Chain Error Hole 3: 0.0702
Right Chain Error Hole 4: -0.4148