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My knowledge in gears in limited to their types (bevel, spur, etc). I am trying to combine the power/torque of two DC motors using a differential gear.

I have a good handle on the idea and design from here and here

The problem I am having now is finding the correct differential gear to use (in term of shaft size, etc).

For a PoC I don't mind using Lego or plastic. Eventually these two motors will connect via another differential to two other motors (which have their own differential) for a total of 4 to hopefully turn the drive shaft of this kettcar.

My overarching question is:

  1. How/where do I choose the correct differential to use?
  2. How do I scale up/down the motor's output shaft to fit into whichever differential gear I end up using?

As to "why" do this:

  1. Learning
  2. Learning
  3. Fun

That said, if this approach is bat-crap crazy, then please feel free to say so and suggest an alternative.

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    $\begingroup$ Look at the second answer to Effective ways to drive a single shaft with multiple motors?. Just use two identical motors, driving the output shaft in parallel through identical gears or belts, and connected in parallel electrically. $\endgroup$ – TimWescott Aug 9 '19 at 18:20
  • $\begingroup$ @TimWescott I saw that also, but I saw more answers against that in terms of the motors being identical in their output. $\endgroup$ – Sam Hammamy Aug 9 '19 at 18:41
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    $\begingroup$ As long as your motors are the same make & model, and are identically geared, they'll be close enough. $\endgroup$ – TimWescott Aug 9 '19 at 18:50

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