* gear 1
| pitch circle    | ~60 mm |
| number of teeth |     40 |
| module          | 1.5 mm |
| pressure angle  |     20 |

* gear 2

| number of teeth |      9 |
| module          | 1.5 mm |
| pressure angle  |     20 |

| number of teeth |     40 |
| module          | 1.5 mm |
| pressure angle  |     20 |

* 3

| number of teeth |     9  |
| module          | 1.5 mm |
| pressure angle  |     20 |