Gear driven object plate for 3D scanner

It has four gears.
Gear A: T10
Gear B: T60 and T10
Gear C: T60 and T10
Gear D: T100

It makes the final gear ratio to 360:1. One rotation of Gear A makes one degree rotation of the object plate where an object seats and be taken shot by a DSLR camera.

Gear ration calculation:
T10 to T60 makes 6:1
T10 to T60 makes 6:1
T10 to T100 makes 10:1

Final gear ratio is to multiply the three gear ratios: 6 x 6 x 10 = 360.

Parts:

Hole diameter 3 mm and outer diameter 10 mm bearing