on video This Gearbox is So Powerful it can Pull a CAR! (3D Printed)

 This gearbox is so strong/powerful and it can pulls a real car. All the plastics are 3d printed PLA. The gearbox uses 775 dc motor and the gear ratio of the gearbox is 98:1. The worm gear has 40 teeth. So the gear ratio in the worm gear mechanism is 40. Here there is a really high torque increase in one stage. I choose to go for helical gears on this one because they produce a lot less noice than regular spur gears and the forces on the teeth are transferred more gradually. Output shaft has a 20 mm diameter and I used 2x6004(ORS) roller bearing to support this output shaft.I was able to test the gearbox to a torque of about 43 kg*cm.During testing none of the gears broke

Do not use this design in the professional field. Because you can't trust to plastic parts!

Below are all the parts I used in this project:

12V DC 775 Motor(100 Watt)

608zz bearing x3

6004 bearing x2

20 mm aluminium shaft

M8 threaded rod

Cotter pins 

2x30—x4

3x50—x1

 This gearbox is so strong/powerful and it can pulls a real car. All the plastics are 3d printed PLA. The gearbox uses 775 dc motor and the gear ratio of the gearbox is 98:1. The worm gear has 40 teeth. So the gear ratio in the worm gear mechanism is 40. Here there is a really high torque increase in one stage. I choose to go for helical gears on this one because they produce a lot less noice than regular spur gears and the forces on the teeth are transferred more gradually. Output shaft has a 20 mm diameter and I used 2x6004(ORS) roller bearing to support this output shaft.I was able to test the gearbox to a torque of about 43 kg*cm.During testing none of the gears broke

Do not use this design in the professional field. Because you can't trust to plastic parts!

Below are all the parts I used in this project:

12V DC 775 Motor(100 Watt)

608zz bearing x3

6004 bearing x2

20 mm aluminium shaft

M8 threaded rod

Cotter pins 

2x30—x4

3x50—x1