I have to project a mechanism that transform a rotation of $30 \pi/s$$30 \pi/\text s$ from a engine in a rotation of $(\pi/4)/s$$(\pi/4)/\text s$.
One of the gears should be $120x$120x bigger than the other, but this is too much.
The gears should have a ray $< 30 cm$$< 30\text{ cm}$.
How can I create this mechanism?