Technic Generic WIP / Proof of Concept Topic

[ord]

Putting a few of my WIPs here in the hope it will motivate me to finally finish them:

6-axis robot arm

Have built the gripper and joints 1, 4, 5, and 6. 

Pneumatic clocks

Have built 2 that work in sync. Need to make them look nice then make a video.

Internal gear hub

This could be my favourite - it's a working 3-speed bicycle hub gear. It's difficult to show the internal workings on video so I'm thinking of making a 3D animation (which will also be difficult/time consuming).

[Fluwoeb]

On 4/30/2024 at 3:30 PM, Fluwoeb said:

post pictures later this week after I get past my finals for school.

Okay, so I ended up getting busy again, but here are some pictures for you guys. It is going to have a hobby RC body and components but for the most part I will use Lego parts for the chassis.

[2GodBDGlory]

Is that a driven, steered, virtual pivot steering system? Very unique! This should be a cool model

[Fluwoeb]

@2GodBDGlory Yes, it is a virtual pivot steering system! Ever since I saw LegoMarat's Dakar Hummer model, I wanted to recreate a virtual pivot suspension system that was a little more robust. Unfortunately my design does not get the pivot point in the center of the wheels, it is more towards the inner edge, but it will be helpful either way because it will decrease wear on the tires with use. I used the differential from the Ferrari set and the CV joints from the Audi e-tron set. It worked out quite well and I was able to fit the a V-10 on top using the standard Lego piston engine 

[msk6003]

Narrow thick(least 6 stud) 7 segment display
I originally made this for my new clock but it is to wide to hanging on wall and hard to make one-by-one stepper mechanism. 

Edited May 13, 2024 by msk6003

[Aurorasaurus]

On 5/12/2024 at 9:14 AM, Fluwoeb said:

Okay, so I ended up getting busy again, but here are some pictures for you guys. It is going to have a hobby RC body and components but for the most part I will use Lego parts for the chassis.

This blows me away, I'm really impressed, and can't wait to see the end result.

Meanwhile, I've come up with what I consider a more desirable way to get caster angle in driven front suspension. I think it's better than what I was doing before because its simpler. And with some more work should prove to be stronger as well, as it uses mini turntables for wheel hubs. I got the idea to use mini turntables and 3d printed rims from the buwizz daytona mod.

https://bricksafe.com/pages/Aurorasaurus/miscellaneous/turntable-hubs

This is just a proof of concept for now, but it's exciting me. I'll probably use longer suspension arms and the slow output tomorrow night.

[Carsten Svendsen]

6 hours ago, Aurorasaurus said:

This is just a proof of concept for now, but it's exciting me. I'll probably use longer suspension arms and the slow output tomorrow night.

I don't think using CV joints is a great idea when you directly couple it to that type of motor. I haven't tried any applications like this, but I would imagine that it comes apart quickly.

[Aurorasaurus]

3 hours ago, Carsten Svendsen said:

I don't think using CV joints is a great idea when you directly couple it to that type of motor. I haven't tried any applications like this, but I would imagine that it comes apart quickly.

In my experience its fine so long as you brace everything around it well. Thanks for the concern though!

[Fluwoeb]

On 5/14/2024 at 7:12 AM, Aurorasaurus said:

This blows me away, I'm really impressed, and can't wait to see the end result.

Thanks! It will be able to easily drift, as long as I am able to integrate an RWD/AWD selector that is. The power the RC components have is unreal:)

Also, that is a really simple idea for getting a caster angle on your suspension, I like it! It might be a good idea to put some 5L liftarms vertically on your suspension arms to help brace them, of course you'll have to space them apart 2 studs with the offset of the suspension arms though:) But you mentioned working on strengthening everything so you probably are already on this.

Edited May 16, 2024 by Fluwoeb

[Fluwoeb]

Here is a small update:) I added a V10 to the front axle, and it fits very nicely in-between the shock absorber posts. I have used this method to hold a piston engine before, but I didn't use a pulley piece for to locate the camshaft, which is a little unconventional. I wanted to get as close of a spacing to the axle as possible while keeping the 12tooth bevel for steering from colliding with the engine camshaft so I used some old half bushings as you can see if you look closely.

[Jurss]

Isn't everything too high, will You be able to fit everything nicely under bonnet, so id doesn't look like some stanced offroader? Or is that and idea :)

 

[Fluwoeb]

22 hours ago, Jurss said:

Or is that and idea :)

 

Wait and see... You'll love it I'm sure! 

[Davidz90]

On 5/13/2024 at 3:58 AM, msk6003 said:

Narrow thick(least 6 stud) 7 segment display

Wow, this is seriously compact for a 7-segment display!

 

Speaking of counters, here's proof of concept of compact decimal one:

 

[SNIPE]

2 hours ago, Davidz90 said:

Speaking of counters, here's proof of concept of compact decimal one:

Love this idea, but one small posssible issue: Won't the green round 1x2 plates just break off? - since they're only attached on by 1 stud.

[Davidz90]

2 hours ago, SNIPE said:

Won't the green round 1x2 plates just break off? - since they're only attached on by 1 stud

Yes, that is a concern, although it didn't happen to me. Some other plate (of the 1x2 with something sticking out variety) may be a better idea. Or just sandwich the green plates between two round ones.

[Stereo]

The 1x2 with towball on the side looks like a good fit to me, but I haven't built the mechanism, and there are really quite a few options.

[Davidz90]

18 hours ago, Stereo said:

The 1x2 with towball on the side looks like a good fit to me, but I haven't built the mechanism, and there are really quite a few options.

Out of these 4, I have top and right one. Tested both and they work fine.

[msk6003]

Another WIP of fiat 131 abarth

Putting aside whether it was actually possible or not, I decided to just create the appearance. I used existing parts for 'OLIOFIAT' logo but those parts is rare and don't have A and T so maybe I will use just normal 1x1 tile and write letter using pen.

And I still can't decide which control method will use for this car.

Planned function

Drive with L4 engine

Steering

McPherson on front, Swing arm on rear(both independent) 

Maybe light

Edited May 27, 2024 by msk6003

[Fluwoeb]

Here is the RC body for my WIP truck. It is based on a 1979 Ford F-series, and I still need to apply stickers and put holes in it to connect it to the chassis (which is nearly finished). The truck body is a 1/10 scale replica, and I am designing the chassis with a 35-stud wheelbase (from wheel center to wheel center). I had already made one draft of the chassis but the transmission and rear axle had weak points, so I have redesigned the orientation of my steering and drive motors, and battery so that it can accommodate a different more rigorous drivetrain and rear axle. My favorite part was that I was also able to include an RWD/4WD selector and a rear diff lock with the latest prototype chassis so I can go drifting!!! 

P.S. I also have some extra servos from an old scrapped RC plane so I will be able to control the RWD/4WD and diff lock remotely!! 

On 5/27/2024 at 2:44 AM, msk6003 said:

McPherson on front, Swing arm on rear(both independent) 

Hey @msk6003! That looks pretty neat so far! I would be interested to see how you designed your suspension (in front and rear) as I have dabbled with those 30.4mm D. wheels quite a bit...

Edited June 6, 2024 by Fluwoeb
Embed image links

[msk6003]

6 hours ago, Fluwoeb said:

Hey @msk6003! That looks pretty neat so far! I would be interested to see how you designed your suspension (in front and rear) as I have dabbled with those 30.4mm D. wheels quite a bit...

You can find real build image on first page of this topic. I decided to use Buwizz 3 and 2 buwizz motor for drive this model but due to motor size I flipped whole rear suspension module 180'. It make remove spare tire due to no space for it. I will make separate topic of it soon.

And about wheels, I considering change wheel cover to DBG wedge belt wheel.

Edited June 7, 2024 by msk6003

[Fluwoeb]

10 hours ago, msk6003 said:

You can find real build image on first page of this topic.

I found it, thanks! I really like the McPherson suspension you designed, I'll have to try it out and see how well it works.

[msk6003]

2 hours ago, Fluwoeb said:

I found it, thanks! I really like the McPherson suspension you designed, I'll have to try it out and see how well it works.

I made simple instruction of one side of suspension.

Note pinhole with 1L pin on step 22 is essential. Suspension travel length is 0.5L.

[Ryokeen]

So my little wip/prototype that will be used for a shooting mechanism with compressed air. A quick release valve that can be operated with a servo(lego, cada, geekservo).

The requirements were that one direction closes the valve and the other opens it while returning to the neutral position of a servo should not alter the state of the valve itself. That was to prevent strain on the motors and not have to spend battery life on a closed valve during pressure buildup. Also the opening is only triggered by the servo, but the rubberband does most of the jop, so it works equally well with different servo speeds and opens faster then a servo moves.
The valve itself works by tube squeezing but with rolling 1L beams to lessen the wear and make the valve close easier.

Little demo video( no idea why it won't embedd):

https://www.youtube.com/watch?v=ifIEb_PFvII

Edited June 7, 2024 by Ryokeen

[Aleh]

Hello, let me share some WIP which is still do not deserve a separate topic.

I'm slowly building another crane. This time it's a still unexisting Mammoet SK6000

The real crane is still in develpoment and would be released this year maybe, so there is a lack of the data in the WEB, so my build is based on rendering/SK350 model information.

Two interesting points about the crane:

- It's almost ring crane. but the counterweight isin the center and the crane moves on two rings of railways - internal and external - this was challenging to calculate how to install all 48 wheels on 4 rails..

- Main tower raising does not uses winch - MAmmoet developed a special mechanism here and I'm already trying to implement this out of lego. Regular winch uses for hooks only I assume.

[Davidz90]

Whoa, that thing is going to be huge!