Fastest 3D Printed Gearbox Ever.

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[mrzimm]

Cool
But did you think of using bearings for gears ? You already use non printed axels
Bearings can significantly reduce friction between gears and axels, resulting in much higher resulting speed.
Also bearings will help with precision which will help to reduce friction between gears and will not let them wobble (this is frictions losses too)

And if you mad enough you can end up using ceramic bearing instead of usual ones, which do not need grease and have extremely low friction.
This will give you the best result, but using ceramic bearings will be very costly in comparison to usual bearings

[billdoodson]

You would get higher speeds just by lubricating the gears with a silicone spray. You could do a before and after run to see how large the improvement is.

[waldfruchttee]

im not a engeneer or something like that but i think torque would be a problem

[Lucas_sGarage]

there is no way that little power brick can do 350w, that's why it cuts out

[mosesm.]

The key is, for that 35, 000 rpm motor on Amazon, that rating is given with ZERO load. (And that motor is probably not strong enough to sustain that RPM with a load)
So potentially a 2:1 gear ratio attached to it might have such a load as to reduce the motor speed by half, thereby only maintaining 35, 000 on the output side of this 2:1 gear ratio.

[DavidIsTheWalrus]

I would also consider teeth design, I recall another creator finding herringbone gears handling the friction problem a lot better when it comes to 3D printing.

[gqinc]

You need a way better power supply, that brick can't supply the amperage that motor needs, that's why it shut off

[pixelapse]

5:36 Best Quote ever for Mechanical Engineering students

[Bomber_fireworks]

Hey, just a thought, you could try to use magnetic gears to avoid friction, plus put gears on a special high speed ballbearings. Eventually, the speed is limited by the material strength, at some point the gear will self destruct by the centrifugal force, so maybe the last gear could be made from metal. Theoretically, few houndreds thouthands PRM could be reacheble

[iangreenhoe]

A great experiment to repeat WITH THE AXLES ON BEARINGS

[JoeBlow-zrru]

The motor is *_not_* going to suddenly "stall" as the power continues to be increased (unless it burns out). Instead, it would simply reach a maximum speed. Probably you reached the current (or temperature) limit of your supply's regulator (or maybe the speed controller), and it shut off it's output to prevent damage, until the load was disconnected (or the semiconductor device cooled down). You can check this with a voltmeter across the motor wires.

[thetomster]

a got a few questions:
- why not adding bearings?
- why not adding lubrication?
- why not furthermore decrease mechanical tolerances? its seems to have a huge amount of play
- why not improve on the gearteeth design?

[aidanschmidt]

I am pursuing an internal combustion engine development career. I think that a simple $100 harbor freight 212cc engine could have enough torque to get 100k rpm

[ogysmet]

For speeds like that, ball bearings with the proper C value will be a game changer, every C value is for a particular rotation speed. This will enable you to stop the gears from rubbing and shifting back and forward on the axle. I use C3 barrings up to 20k rpm. Above, you would probably need type C4.

[bombn]

Try building a transmission where you can change gears to build speed more efficiently, also try installing bearings on each gear to reduce friction

[Derpynewb]

torque multiplication also works the othet way. thay ratio also works in reverse for multiplying the resistance of that gear.

[Twostrokejoe]

the large pivots are a high point of friction. make them a lot smaller, or place the gears on bearings. i think the limit for speed will be when one of the gears flys apart.

[simoesp]

some issue you have is also power the wires and transformer you were using definitively doesn't trow 14 Amps for the motor to hold on the 350W

[null_x]

That tiny little power supply will never be able to drive a 350 watt motor.

[dheerajkr.]

you should add a flywheel to the last gear to get maximum output