REQUIRED GEAR FORMATION FOR PITCH : 0.75
GEAR TO SPINDLE RATIO : 4.5 
AVAILABLE GEARS : 20, 21, 30, 33, 40, 42, 45, 50, 63, 80, 100 

A=30
B=42
C=63
D=40
0.75 pitch was found after : 1178 iterations!