A gearbox with 3 shafts and 8 helical gears.
Gears of shaft 1: module=4, No. of teeth=30
Gears of shaft 2: big: module=4, No. of teeth=70
small: module=8, No. of teeth=30
Gears of shaft 3: module=8, No. of teeth=50
The electrical motor is connected to the shaft 1 with flange coupling.
HINT:
In order to be able to see the main assembly file in SolidWorks with gears working, you need to copy the files in the zipped folders "1" and "2" to the folder "3". (merge folders). I just put them in three parts because I couldn't upload them together due to my slow connection.
Enjoy it! ;-)