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Can you give me some advice how to make it so motor will be in the middle, but at the same time keep the functionality of the 2 axles on the sides? It can go further up if necessary.

motor configuration

RSchulz
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Neikar
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  • Can you confirm two conditions please: 1) should each axle rotate in different directions? 2) should axles spin at the same speed? – Alex Mar 03 '22 at 14:47
  • Yes, that's corrrect – Neikar Mar 03 '22 at 14:51
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    Just an observation. I hope you've used blue pin to attach gear just as a placeholder in your picture. This won't work well with real bricks, even with frictionless pin. It is better to use an axle instead, braced with liftarm/beams from both sides. – Alex Mar 03 '22 at 15:15

2 Answers2

19

I'd address this with bevel gears:

enter image description here

Michael Verschaeve
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  • Interesting. What are the advantages/disadvantages to bevel gears over a solution closer to OPs original design (such as Alex’s solution)? – DukeSilver Mar 04 '22 at 21:47
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    More symmetric solution, avoidance of the 8 tooth gears (which Alex also indicated don't bear load/speed well), less backlash (or at least the backlash distributed symmetrically over the resulting axles). Not knowing OP's further design intentions my solution might of might not fit better, but at least OP now has an alternative option. – Michael Verschaeve Mar 04 '22 at 22:15
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    It also has an advantage of being already well braced. And for some reason I have a suspicion it may even have less friction. – Alex Mar 05 '22 at 07:57
  • If size is an issue, you could use a 7L beam if you removed the outer two black frames, and replace outer two tan bevel gears with double bevels. – Matthew Jensen Mar 09 '22 at 03:31
  • @Matthew, not sure what you mean, but I would imagine such solution has poorly braced gears – Michael Verschaeve Mar 09 '22 at 04:36
  • My mistake, you are right, I forgot about the torque... – Matthew Jensen Mar 10 '22 at 03:52
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Something like this would work. Since this is just an idea pictured assembly doesn't feature any bracing required for this solution to work properly. Another thing to mention - 8T gears doesn't like high load (both torque and rotational speed), so keep that in mind as well. Axle in the middle has been added just to show it is connecting 8T gear with 16T below.

Assembly with 8T gears

To minimize wear on the 8T gears, consider replacing the with 24T gears (if they fit inside your model), like so:

Assembly with 24T gears

IvanSanchez
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Alex
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