6

I'm looking for the best way to gear down a Power Function XL.

I need to achieve a very slow output RPM (less than 1-2 RPM). I've tried a 625:1 gear (trough 40:8 gear). Can someone link to a well done gearbox like that? Moreover, how I can make an axle more resistant at high torque (I've tried with brick round 2x2).

Improve this question
2
  • Do you mean less than 1-2 RPM? As written, you're indicating greater than 1-2 RPM.
    – Nick2253
    Oct 21 '14 at 18:50
  • 1
    Yeah, I mean <1-2RPM (or around).
    – Imlach
    Oct 21 '14 at 19:10
4

The XL motor runs at approximately 220 RPM. Therefore, the following gearbox from the ELEC 201 class LEGO Design module from Rice should be sufficient:

LEGO 243:1 Gearbox

Improve this answer
2

You can use a worm gear for a compact, high ratio gearbox. By putting a worm gear on the motor shaft and using it to drive a 24 tooth gear you can achieve a 24:1 reduction.

For example

For high torque applications you could use multiple parallel axles held together by gears or wheel hubs.

Improve this answer
2
  • Sadly, a 24:1 doesn't resolve my problem. Maybe i can add some other gear using worm gear as the input.
    – Imlach
    Oct 22 '14 at 18:18
  • Then by using two of these assemblies you can achieve 576:1 reduction. Or if that is too much, you can get another gear either before or after this setup for an additional 2:1 or 3:1 reduction.
    – zovits
    Oct 22 '14 at 18:43

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.