10

I would like to use a subtractor in my next RC LEGO tank, as it enables the vehicle to turn on the move, as opposed to stopping and then turning.

Unfortunately, the subtractors I have tested so far cannot withstand the torque of heavy vehicles, which either causes the subtractor to break apart, or the differentials/gears to grind.

Does anyone know any subtractor designs which are able to deal with high tension/torque/stress levels so that enormous vehicles can still use them? 3kg-5kg tolerance would be ideal.

5

It sounds like you need a stronger differential.

Might I suggest this design by Nazgarot:

enter image description here

If you make two, you can build a big and sturdy subtractor like this (probably customizing the gear ratios to your requirements, the right gearing could also remove the need for a PF switch):

enter image description here

enter image description here

enter image description here

Here's a video of it in action:

enter image description here

  • 2
    Very nice answer. You deserve to get the six-sided hat for this. :) – jncraton Dec 13 '18 at 2:58
  • Excellent. I've come back to this question like 4 times hoping someone had finally figured out a decent answer. – MindS1 Dec 13 '18 at 15:06

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.