# Get high torque out of stepper motor

I have a project where I need to lift about 2 kg about 15 cm above the ground with a stepper motor. I understand the holding torque can be calculated force times distance. So that would give me holding torque of:

2kg x 10N x 0.15 = 3 Nm


Is this correct?

These kind of steppers are however pretty expensive and since I need around 15 pcs of them I need to look for some cheaper options. Are there any other way increasing the torque? Ive read about worm gear but havnt find any that suits my project. Any recommendation would be apreciated.

Another option would be to lasercut some gears out if wood for making my own gearbox, not sure how to do it properly though. Is it enough to have a small cogwheel rotating a bigger for generate lower speed but higher torque and in that case how can I calculate how much?

Any tips of good approaches of increasing the torque?

UPDATE I found this calculator. Seems to be enough with a really big cogwheel :) https://www.omnicalculator.com/physics/gear-ratio

• 15 cm is a wheel radius? Commented Feb 2, 2022 at 21:01
• no just how high I need to lift something. Commented Feb 2, 2022 at 21:08
• what is "centre of gravity of the weight" :) Commented Feb 2, 2022 at 21:30
• Ok, I understand. That could be about maybe 4 cm so then the calculation would be: 2kg x 10N x 0.04 = 0.8 Nm right? Commented Feb 2, 2022 at 21:40