17

I need a mechanism so that if a (NXT) motor rotates forward, it moves one gear, but the other stays still, but if it rotates backwards, the first gear does not move, but the second one does.

I found an example solution for one half of the problem here (I would need 2 of these), but that seems like it would take part of a rotation to pick up, and I need mine to be really precise.

I am building this for the Z-Axis/Extruder of the NXTStrap.

Improve this question

1 Answer 1

Reset to default
15

Would this solve your problem? Depending on the direction of the input, only one axle will turn. Depending on the direction of the input, only one axle will turn

Improve this answer
3
  • Does this solve @Ari Porad 's problem? The best resolution you could get with this device is 1/4 of a turn.
    – MindS1
    Dec 25, 2018 at 0:52
  • ^ Why would you say that? It's free to rotate as much as it wants, because the four-lobed "Gears" will simply slip underneath the angled stoppers, in one direction.
    – RallyToMe
    Dec 25, 2018 at 20:34
  • 1
    @RallyToMe, technically MindS1 is right, it could take as much as a quarter turn until the knob wheel gets locked. This can however be reduced by using ordinary gears, the more teeth the smaller the error at the price of increased size.
    – zovits
    Dec 25, 2018 at 21:24

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

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