I have a nema 17 motor and I'm trying to lift 5 pounds of weight at a distance of 16 inches.
Correct me if I'm wrong, but it comes out to roughly 9 newton meters of torque required.
On my digital scale, the motor can apply 260 grams of force at a distance of 56 millimeters.
aka 14560 g/mm aka 14.56 kg/mm aka 0.14 nm
9nm / 0.14 nm = 64 times weaker that needed
So I created a split ring planetary gearbox that has a 92:1 reduction ratio using this site:
Pastable I O B: 15 30 31
Input Teeth: 15
Base Teeth: 31
Output Teeth: 30
Then I created and 3d printed the gearbox:
When I test the gearbox against the digital scale. It is only able to apply 1000 grams of force with an arm 57 mm long before stalling out.
57000 g/mm aka 57kg/mm aka 0.56 nm
Which is only a strength multiplication of about 4.
It was my understanding that the reduction ratio correlates directly to the torque and speed.
The output shaft would rotate 92 times slower, but have 92 times more torque.
Where did I go wrong in my understanding of this?