Technic Generic WIP / Proof of Concept Topic

[Aurorasaurus]

It's been a bit since I've shared any updates on what I'm working on, and I finally decided to sit down and make a post.
I've built another 6x6 chassis, this time using 28t bevel gears for every wheel instead of 12t gears, meaning the whole thing is a lot stronger. Now I'm just waiting for a nice day on the weekend to take it out and test it some more. Until then, I have some photos and a video from testing the chassis.

Some photos of the "finished" model

It even has seats and a steering wheel!

After seeing JLiu's race buggy, I wanted to make my own, with a larger focus on performance.

With the big RC tires you can see in the left of the first photo, I was able to get it up to 20 km/h on the pavement outside my house. I think it could go faster on a warm day on smoother ground. I'm using 2x buwizz 2.0, and 2x CADA buggy motor, hard couple, wheels driven from the slow output.

However, this model is more about being fun..

Soo, I tried some silly ideas out on it.

I also tried 3d printing a tire from 95a TPU, just for fun.

I'm quite happy with the tread pattern, but overall everything is too think so it is very stiff.

Edited June 13, 2024 by Aurorasaurus
forgot an entire project XD

[Aurorasaurus]

I think I'm onto something with this... more coming soon...

[Aurorasaurus]

Since it's nearly the weekend, I might find some time to video this one. I recorded its top speed without a body at 20.2km/h on bumpy concrete. I'm using the slow output of a buwizz motor geared up 24:12 per rear wheel. The body is kinda disjointed, the rear is inspired by RX7's with ridiculous body kits, while the front is inspired by Porsche 911's. Im also using 3d printed wheel arches, since I don't own those parts yet. I'd be glad to answer any questions.

[Fluwoeb]

I did get my truck operational, I just have to apply stickers and rebuild the rear part of the chassis... again. I did the paint job myself so let me know what you think!  

After I got it working and drove it around a little, I had to reprint the RC motor-to-Lego adapter because it started cracking and the motor spindle was spinning inside of it, and then the new CV joints gave out... I didn't have the CV joints at the best angle going to the rear diff so they ended up breaking, but they did so in a very unique way which I haven't seen before, at least from what I have seen on the EB forum with some of the people who have used the new CV joints with Buwizz. The longer part of the piece was largely intact with little damage, but the other part of it...

As you can see the little knobs or pins that stuck out from the inside of the short piece got smushed...

Edited June 22, 2024 by Fluwoeb

[Lixander]

@Fluwoeb the paint job looks excellent!

Also, it is really interesting the damage you got on the new CV joints. But I think the angle you mentioned in the middle of the post explains it all.

And @Aurorasaurus great little car.......you can say it looks like the Gemballa Marsien.

Edited June 22, 2024 by Lixander

[Aurorasaurus]

10 hours ago, Fluwoeb said:

I did get my truck operational, I just have to apply stickers and rebuild the rear part of the chassis... again. I did the paint job myself so let me know what you think!  

After I got it working and drove it around a little, I had to reprint the RC motor-to-Lego adapter because it started cracking and the motor spindle was spinning inside of it, and then the new CV joints gave out... I didn't have the CV joints at the best angle going to the rear diff so they ended up breaking, but they did so in a very unique way which I haven't seen before, at least from what I have seen on the EB forum with some of the people who have used the new CV joints with Buwizz. The longer part of the piece was largely intact with little damage, but the other part of it...

I like the paint job, but I think it might look better with bigger wheels, have you tried them?

Also, I've never seen cv joints break like that before, very interesting!

9 hours ago, Lixander said:

And @Aurorasaurus great little car.......you can say it looks like the Gemballa Marsien.

Thank you! Upon looking up the Gemballa Marsien, I do see the resemblance!

[Fluwoeb]

21 hours ago, Lixander said:

@Fluwoeb the paint job looks excellent!

Thank you!

12 hours ago, Aurorasaurus said:

I like the paint job, but I think it might look better with bigger wheels, have you tried them?

Thanks! And yes, I agree, it would look better with bigger wheels. The problem I had was that I bought some 1.9" rock crawler tires, but the chassis wasn't lifted enough to fit them under the wheel wells. So I temporarily bought some of the red 56mm D. wheels and the thin tires (which were really the cheapest option  ).

My main problems with putting bigger wheels is the reduction of torque (it is already very fast, but I haven't been able to measure the speed yet), and the initial jerk of the motor when I start accelerating the truck. I plan to put one of the Lego clutches in-between the motor and the drivetrain to possibly help reduce the initial jerk, and then to make a bigger gear reduction gearbox between the motor and the drivetrain to help with torque for off road driving.  The funny thing is I already have an RC 3:1 planetary gearbox on the end of the motor, it is just so powerful!

[Lixander]

49 minutes ago, Fluwoeb said:

My main problems with putting bigger wheels is the reduction of torque (it is already very fast, but I haven't been able to measure the speed yet), and the initial jerk of the motor when I start accelerating the truck. I plan to put one of the Lego clutches in-between the motor and the drivetrain to possibly help reduce the initial jerk, and then to make a bigger gear reduction gearbox between the motor and the drivetrain to help with torque for off road driving.  The funny thing is I already have an RC 3:1 planetary gearbox on the end of the motor, it is just so powerful!

What motor do you use? And also, what is the final gear ratio?

[Fluwoeb]

5 hours ago, Lixander said:

What motor do you use? And also, what is the final gear ratio?

I am currently using a HobbyWing 3652SL 3250KV motor run with a 11.1v lipo. (I bought this ESC and motor combo from Amazon)

The final gear ratio is 23.57:1.

I think part of my problem with the jerkiness is due to the controller, I just need to fiddle with the throttle trim a little more. I am using a 3 channel GoolRC receiver and controller.

For now I am putting this project aside to focus on a build for TC27:)

[Lixander]

12 hours ago, Fluwoeb said:

I am currently using a HobbyWing 3652SL 3250KV motor run with a 11.1v lipo. (I bought this ESC and motor combo from Amazon)

The final gear ratio is 23.57:1.

I think part of my problem with the jerkiness is due to the controller, I just need to fiddle with the throttle trim a little more. I am using a 3 channel GoolRC receiver and controller.

For now I am putting this project aside to focus on a build for TC27:)

That gear ratio is more than enough and the motor - ESC combo most likely is ok so all that is left is the controller.....so yes, try to play a little with the throttle trim :)

Also, you can try to inverse 2 wires on the motor, if the instructions manual states that you can do so in case of some problems. My SkyRC combo (3650 330kV motor with 60A ESC) is still stuttering at low-medium throttle, but I had discovered that the motor was inversed when the wires were color matched.

So when I switched 2 wires, the motor started to run at its full power.

Edited June 24, 2024 by Lixander

[Fluwoeb]

6 hours ago, Lixander said:

So when I switched 2 wires, the motor started to run at its full power.

Thanks for the suggestion! I'll let you know what happens after I get back around to it.

[Dazzzy]

I thought I'd post this here as I don't think it merits it's own thread yet.  It's still a work in progress and in need of a major rebuild/design up front, as well as a slightly better solution for rear wheel travel. 

I set out to make a motorised (albeit very under powered) buggy that's slightly reminiscent of the classic 'Tamiya Wild One' RC car.  It's not very fast at all as it's around 900 parts, and must be at least twice (if not more) the weight of set 42124. I'd like to make it more powerful but third party solutions are out of my price range (maybe in the future). 

So far I'm happy with the frame, although the PU L motor driving the rear wheels could do with a little more bracing, as it moves slightly under torque load. As far as the springs go, I'm still playing around with different springs and exactly where to place them. I do like the squat look of the rear, but I guess it should be slightly higher.  As for the front, I haven't quite worked out a good steering geometry,  so it's definitely going to need a rebuild/redesign as although it does turn, it's too wide of a steering circle. 

Apart from those two issues I'm also looking at adding some bucket seats that hinge forward, (to access the battery box). It would be nice to add some kind of driver too as the steering wheel steers, but I think that might be a little too ambitious. 

(please excuse the poor quality pics):

 

[msk6003]

@Dazzzy

Cool. I also previously made a Wild one (Blockhead Motors version). Since I focused on recreating the actual RC car 1:1 with LEGO, the entire structure's mounting points are almost similar, but the durability of the front steering part is a bit of an issue.
I still need Dark Azure 15 Beam and various Dark Azure panels, which are difficult to obtain in my country.
My model uses 1 Buwizz 3 and 2 Buwizz motor, 1 C+ L motor.

[NV Lego technic]

36 minutes ago, Dazzzy said:

third party solutions are out of my price range

Buwizz motors are pretty cheap IMO but a buwizz unit certainly isn't. You can use geekservos along with lipo battery and a receiver, but I don't know if you consider that cheating or not...

[Dazzzy]

2 hours ago, msk6003 said:

@Dazzzy

Cool. I also previously made a Wild one (Blockhead Motors version). Since I focused on recreating the actual RC car 1:1 with LEGO, the entire structure's mounting points are almost similar, but the durability of the front steering part is a bit of an issue.
I still need Dark Azure 15 Beam and various Dark Azure panels, which are difficult to obtain in my country.
My model uses 1 Buwizz 3 and 2 Buwizz motor, 1 C+ L motor.
 

Thanks. Yours looks fantastic!  Will keep my fingers crossed that you can somehow acquire the Dark Azure 15 long lift arms you need, to truly complete the look. 

I wish I had the real deal 'Tamiya Wild One' to be able to do what you've done with your LEGO version, but I've never actually owned a proper Tamiya RC. Besides set 42124 (great bargain that) the only other form of RC I've ever owned, are a few of those 'Tomy/Tomica Bit Charg-G' cars.  

I suppose the major issue with my MOC at the moment, is trying to replicate a good alternative to the steering links of the actual RC. Unfortunately LEGO steering links just aren't long enough to do that. So it's a case of back to the drawing board for me. 

2 hours ago, NV Lego technic said:

Buwizz motors are pretty cheap IMO but a buwizz unit certainly isn't. You can use geekservos along with lipo battery and a receiver, but I don't know if you consider that cheating or not...

Thanks for the suggestions and I will bare them in mind. For now though I'll be sticking with the 2 L motors and PU hub, as that's what I already have at my disposal. I do also have a PF hub/battery box and a medium motor, but even if I go with that route it would require me getting my hands on a IR receiver, servo, buggy motor or L motor at least, plus a controller. None of which I can really afford at the moment. But like I say I will look into the alternatives if I can ever afford it. 

[Paul B Technic]

That looks very cool. I love the colours and the way you have built it.

[msk6003]

3 hours ago, Dazzzy said:

I suppose the major issue with my MOC at the moment, is trying to replicate a good alternative to the steering links of the actual RC. Unfortunately LEGO steering links just aren't long enough to do that. So it's a case of back to the drawing board for me. 

I really relate! This was a major issue on my version of the Wild one as well and luckily I found the 9L link to fit, but this time I had an even/odd issue so the steering rack assembly was quite large because that. I can't upload photos right now because I'm at work, so I'll post them when I get off work.

I forget I copied io file to my pc in workplace before :D

So here is the steering lack assembly

And perfect dark azure version with original color version.

But original color version use 4 of this  so it will very hard to make real.

[Aurorasaurus]

Well, I'd to start off with saying that I love the way your buggies look, @Dazzzy and @msk6003, really good work!
 

Recently, I've done yet another rally car, this time with 6 motors, but squished into the size of a 42077. It had spring loaded doors, boot, and bonnet.

https://bricksafe.com/files/Aurorasaurus/42077-max/v5/20240701_193815.mp4

But, I wasn't pleased with the performance (near identical to 4 motor versions, just heavier), so I took it apart. WIP photos and final photos: https://bricksafe.com/pages/Aurorasaurus/42077-max/v5

Then, before taking the rally car apart, I made a trophy truck with cada buggy motors, as I was inspired by Measyn's trophy truck:

 

This one may at some point get some footage, but its currently school holidays in my country so the skate parks are all quite busy. This model uses half disassembled 6.5 stud shock absorbers for the front suspension, because I got lazy with making the normal shock work, and other shock absorbers didn't fit.

Then we come to the final, and IMO the most interesting model of the post. I was inspired by Gyenesvi's Jeep Bruiser alt build for 42110, and since I had 6 motors free from taking my rally car apart, I decided to try making something a bit different.

It comes with a detachable body, which makes it easy to recharge and fix. Since taking these photos I have reinforced some of the obvious weak points.

https://bricksafe.com/pages/Aurorasaurus/jeep-bruiser

If anyone has any questions or suggestions, please feel free to ask or comment!

If I find a suitable location, I'll video the jeep. Currently it's winter in my country, which makes things a bit difficult at times.

[NV Lego technic]

Very cool, I'd like to tru something similar to you jeep, but at a smaller scale because I only have 2 buwizz motors.

[Aurorasaurus]

2 hours ago, NV Lego technic said:

Very cool, I'd like to tru something similar to you jeep, but at a smaller scale because I only have 2 buwizz motors.

You could do something like Attika's swiss knife pickup, I think that was the one with the simple 2 speed gearbox..

[Lixander]

Great W.I.P.`s!

@Dazzzy I recommend to switch to some buggy/ BuWizz motors for your WildOne replica, as someone else said.

Also, @Aurorasaurus did you get a new personal speed record?

 

Edited July 17, 2024 by Lixander

[Aurorasaurus]

5 minutes ago, Lixander said:

 
@Dazzzy

Also, @Aurorasaurus did you get a new personal speed record?

Nope, wheel diameter and weight became the limiting factors, rather than power, sadly..

Sorry Dazzzy, I couldnt remove the tag on mobile.

[Lixander]

7 minutes ago, Aurorasaurus said:

Nope, wheel diameter and weight became the limiting factors, rather than power, sadly..

Sorry Dazzzy, I couldnt remove the tag on mobile.

I see :/

Edited July 17, 2024 by Lixander

[Paul B Technic]

Nice work with these.

[msk6003]

In korea, 'Korea Brick Party' KBP exhibition soon. (8/2~8/3)

I planned to bring 6 or 7 MOCs, but I also need something PR me to people. So I deciced to make QR code for people can take picture.

Generally, when making a QR code with Lego, most people use a combination of tiles on the base plate.

But since I am a Technic user, I wanted to make it using Technic. Due to technic's nature, it was very difficult to prevent it from disassembling, but it was made strong with a large number of 16L axles and half-stud thick beams.

So I finish this. Left one linked to my youtube channel and right one linked to my instagram.

Edited July 25, 2024 by msk6003