3D printed RC truck V3: Gearbox V3A

by MrCrankyface, published

3D printed RC truck V3: Gearbox V3A by MrCrankyface Aug 5, 2016
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Done designing the gearbox V3A, I might do other ratios hence the A.
This is much sturdier than the V2 design and should work fine with the V3 truck, I've testdriven it quite roughly both on tarmac and indoors without issues.

You can check out the assembly video for this and the other parts over at my youtube

Hardware needed:
4x M3x16 for the housing cap
2x M3 for mounting the motor
2x M3x10 for the bearing cap
1x M3x16-25 for the U-joint attachment
2-3 M3x16 for mounting the gearbox to frame
1x M3 grubscrew for securing motor gear to shaft
4x 6700zz bearings(10x15x4mm)

For more V3 parts, check out my V3 collection:

Check me out at:
Youtube: http://www.youtube.com/c/MrCrankyfaceProjects
Instagram: https://www.instagram.com/mr.crankyface/
3d hubs: https://www.3dhubs.com/malm%C3%B6/hubs/mrcrankyface
Patreon: http://patreon.com/Mrcrankyface

Print Settings


The Frankenstein










Print the two housing parts at 20-30% infill, the cap will require support, you can use similar settings for the bearing cap.

Print all shafts and gears at 60-80% infill, the shafts you can print with 3 perimeters to make them even stronger. Adjust your extrusion width to get as much infill as possible in the teeth of the gears.

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These all V3 parts are awesome and so far I have made both the axle, center differential and gearbox. But the major issue u am facing is the parts not fitting. Some are damn tight to fit and some are so snug that once they fit when I try to pull it just breaks off. What is your suggestion on this?

I know its asking for a lot, but can I get the original files for your gearbox? I want to remake it to work with a cheap brushless motor.

could someone tell me the gear ratio on this?

Yes, exactly...what is the gear ratio??

Well. The motor sprocket is 10 teeth and that connects to 31 teeth.
Then you have a second gear ratio of 13 teeth to 31 teeth.

10/31 = 0.32
13/31 = 0.42
0.32*0.42 = 0.1344
For every revolution of the motor, you get 0.13 on the output shaft.
I guess this makes for a 10000:1344 gear ratio.
Or ~100:13

nice approx 8:1...or 7.44:1

Very very cool!!!!!!

Now if I can just figure out how to upscale it and see if I can put it between a gasoline motor and the drive sprocket on a gocart...this way can eliminate that huge 60 tooth gear between the wheels...make it 12 teeth top, 12 teeth bottom...let the gearbox handle the reduction (it's usually 5:1 though) [as a test of course]

Comments deleted.

Absolutely perfect project! Great design and engineering! Thank You for it!
Just one question. Please, how many turns per minute has Your motor? Could You give a link on it? I have no idea, how strong motor to buy.
Thank You.

a stock rs540 is around 17-18k rpm
in brushless thats just under 2300KV with a 2S battery

Thank you! My motor is a no-name 540-sized brushed motor which I think has a max rpm of ~18000.
A slower motor could work quite well as well as it will only slow your top speed a bit.

Comments deleted.

Has anyone thought of using pulleys printed from abs and using O rings or tooth belts instead of gears? Its a relatively low rpm setup just curious how it would hold up...

Well the motor outputs nearly 20k RPM, not sure how it'd work in the long run. Might work better with a lower KV motor.

Great gearbox thinking about printing one to see how it would in a semi

Totally awesome! Definitely going to the axles, and gearbox =). How well are these holding up?

Thanks! They hold up pretty good I'd say! I've printed them in my cheapest PLA and the only thing that's broken is a driveshaft so far(first shaft from gearbox to center differential), and that was when I went full throttle at a jump/ramp.

What are the bearing specs for the V3 Gearbox?

Good thing you asked, I see I missed writing those down in 'Thing details'!
They are 6700zz bearings(10x15x4), same as in the V3 axles.

Thank you for making this! I was thinking of remixing the openrc truggy to solid axle but you've gone and made a solid axle rc already! Will add this to my print list.

Glad you like it! :)