Brushless motors in the lego world - general topic

[gyenesvi]

12 hours ago, vergogneless said:

First, I’ve been experimenting with a new way to mount the gear onto the motor shaft. I replaced the gear’s cross pin with a hole matching the motor shaft diameter (3.17 mm for the A2212). You have to press it in with a hammer, and once it’s in place, it won’t move a bit. I think this is the most reliable solution so far, and it also saves some space.

If the printed gear holds up well, that looks like a really nice compact solution, I like it!

12 hours ago, vergogneless said:

For the first time, I’m also using a servo other than the Geek Servo: the MG90S. Once adapted to the LEGO system, it’s even smaller than the smallest Geek Servo, yet it offers a torque of 2 kg compared to 0.5 kg is a bit faster and more precise, and all of its gears are metal.

Interesting, and what did you need to do to adapt it to the lego system? Are you using a servo horn based or a gear based solution?

[vergogneless]

3 hours ago, gyenesvi said:

If the printed gear holds up well, that looks like a really nice compact solution, I like it!

I’ve tested all the existing solutions, and this one is definitely the simplest, strongest, and most durable. Since the diameter perfectly matches the motor shaft, you really have to hit it hard to insert it, which creates an extremely tight fit. The alignment is also absolutely perfect! To give you an idea, I can’t pull it off by hand, and even with pliers, it’s a real struggle. You actually have to split it open to remove it more easily.

Interesting, and what did you need to do to adapt it to the lego system? Are you using a servo horn based or a gear based solution?

You have several options, I based mine on this one (for the dimensions):

https://www.thingiverse.com/thing:4496227

Because I needed something more specific for my build.

Otherwise, there are also generic versions available: https://makerworld.com/fr/models/1778626-9g-servo-lego-technic-compatible-shell#profileId-1894418

To transfer the steering, I also designed a custom 3.5L horn. But for something more generic, you can use this one:

https://makerworld.com/fr/models/1781412-9g-servo-lego-adapter#profileId-1897609

Or that one, for example:

https://www.thingiverse.com/thing:6010292

 

[gyenesvi]

1 hour ago, vergogneless said:

To transfer the steering, I also designed a custom 3.5L horn. But for something more generic, you can use this one:

Those adapters actually look quite good, simple and easy to print! This could be really useful solution to make servos in alternative form factors (for example flat to put on a straight axle).

[vergogneless]

I also found a mount for a different setup, created by @HorcikDesigns, for the SG90, but I’m not sure if it also works with the SG90S!

https://makerworld.com/fr/models/165631-servo-sg90-to-technic-adaptor-for-brick-models?from=search#profileId-181863

[keepbricking]

Hey everyone!

I have made my IWD lego car, the motors are up and running,  it looks a bit bad, but that's okay

I don't know how to share the video, bricksafe is not letting me create an account nor flickr

@janssnetturns out that I didn't need to setup ESC for DShot, since it takes various signals 

The flight controller only sends the type of signal chosen, the ESC takes and automatically translates any signal it supports 

Yes I needed to share ground between RX and ESC, but that was done simply through a 5v BEC

Now I only need to wait for the 3d-printed tyres to get this car on the road 

I have a feeling it could do 90+km/h! but I do not have a speedometer

[Aurorasaurus]

6 hours ago, keepbricking said:

Now I only need to wait for the 3d-printed tyres to get this car on the road 

What material are you using? I'm pretty sure you'll encounter traction issues if you're using high hardness tpu, and printing issues with low hardness... but I'd love to see a solution, good luck!