when number of pins is infinite so screw surfaces are created.
The working surface of each shaft is created when a circle of radius 5 (in the plane perpendicular to the shaft axis, its center is 20 from the shaft axis) moves along a helix of pitch 40.
Distance between the shafts is 10.
Transmission ratio is 1. The two shafts rotate the same direction.
The mechanism is pourely imaginary product, perhaps no practise application.