[TC14] Dance - 42055 C model

[Akbalder]

It's my first MOC / C model / Lego contest. 

C model of 42055 Bucket Wheel Excavator

It is inspired by this ride.

The structure and each branch rotate.
The seats rotate thanks to the centrifugal force: the weight on the back of the seats and the inclination of the ride varies the rotation speed. The direction rotation of the seats can even change.

 

 

 

 

 

 

 

 

 

 

--- Old first post

My plan for TC14 is to create an attraction with 3 levels of rotation. I'd like to use only pieces from BWE 42055.

https://www.youtube.com/watch?v=zYwtlriA37M&t=0s&list=WL&index=16

The deadline is close but I'm not really advanced. There will be 9 seats will be on top.

 

But once I added the 2nd branch, the motor wasn't able to make it rotate anymore. 
I don't really know how to try to improve it :
- Modify the black turntable to make it rotate. For now, it is fixed and it is only used to move the gears connected to it (https://bricksafe.com/files/Akbalder/tc14/tc_14_2.jpg/1280x960.jpg)
- Connect a gear on the big yellow circle to make the structure rotate
- Connect a gear on the big yellow circle to make the 2nd and 3rd levels of rotation

 

Edited August 30, 2018 by Akbalder

[BrickbyBrickTechnic]

In terms of the messing up the rotation, maybe adding the third module will improve the weight distribution and therefore allow the structure to rotate. Additionally, adding some more gear reduction before the turntable will help (and maybe removing the white clutch gears and replacing them with regular 24z gears).

Is this being built from the pieces of the 42055?

[Akbalder]

I thought that the white clutch gears were required to not damage the motor. I will try without them to see if the gears run without "jumping" or not. If it doesn't, I will try your other solutions.

Yes I will try to make it a C model of 42055.

[Robin_IV]

30 minutes ago, Akbalder said:

to not damage the motor

As far as I know a electromotor can not really be damaged in this way. 

The main purpose for the clutch gear is that there is not put too much force on e.g. a transmission. Because everything is out of plastic it tends to bend when you put too much force on a technic structure which is at it's end of turning and gears will break or parts jump out of their position. So the clutch gears purpose is more to protect the Lego pieces than the motor itself. But for your build it is not really needed because you have a linear and constant movement. Just make sure to reduce the gear transmission so there will not break your gears.

[Erik Leppen]

42055 is really quite the set, I notice. Tons of C models are made, of all different kinds. I say bonus points for that feat alone.

Yes, I thought the same as @BrickbyBrickTechnic: maybe adding the third branch will improve things, because then everything is balanced again. For the rest, you're off to a good start and I hope you can find the pieces in that one set for 9 seats.

[m00se]

Nice to see another ride made from 42055.

 

20 hours ago, Akbalder said:

- Connect a gear on the big yellow circle to make the 2nd and 3rd levels of rotation

This might work with three arms. I have a somewhat similar setup on my ride where I have a single gear on the inside of the circle, but I had to add a short beam on the outside to keep it pressed together a bit (on the picture right above the motor); otherwise the gear inside would just slip. The disadvantage is that this adds some friction. With three gears I think there is less chance they will slip.

 

Alternatively you might consider not motorizing the third level of rotation and let the seats rotate freely. This will cause way less stress on the motor. This is actually how the ride works in real life.

 

[Akbalder]

I added the third branch and fixed a dumb mistake:
The wheels on the yellow circle were rotating in the opposite direction! I made them move completly freely.

In my first attempt the beam was connected directly to the black turntable and it would bend. To fix it, I will use gears going on the outside of the turntable. I think that I will have enough room to also connect gears of the 3 branches on the turntable.

 

11 hours ago, m00se said:

Alternatively you might consider not motorizing the third level of rotation and let the seats rotate freely. This will cause way less stress on the motor. This is actually how the ride works in real life.

I search for videos of the ride after having decided what I wanted to do in Lego. I didn't know that the seats weren't motorised.The real ride has good seats movements because they are very heavy and because the structure is leaning. I don't know if it will work in Lego.
I think that I will try both to see which option makes the best seats movements. 

Edited August 24, 2018 by Akbalder

[m00se]

On 8/24/2018 at 9:29 AM, Akbalder said:

I search for videos of the ride after having decided what I wanted to do in Lego. I didn't know that the seats weren't motorised.The real ride has good seats movements because they are very heavy and because the structure is leaning. I don't know if it will work in Lego.
I think that I will try both to see which option makes the best seats movements. 

The fact that the seats do move so well in real life has indeed a lot to do with the weight distribution. Also the angle is important. I agree this is difficult to replicate; certainly with only parts from the BWE. 

[Akbalder]

I tested both solutions for the seats and it works better when seats run free. Thanks m00se for pointing out that they aren't motorized in reality. 

 

I successfully made 9 seats using only the pieces of the BWE so it will definitely be a 42055 C model. 

[pagicence]

/

Edited June 5 by pagicence

[Akbalder]

I finally have a working ride. 

 

I don't know if I should try to add some decoration arround the ride.
Right now, it may be difficult for the minifigs to climb in their seats. 

 

[Magical Duck]

8 hours ago, Akbalder said:

I don't know if I should try to add some decoration arround the ride.

I think some decoration wouldn't go amiss. Although, then it wouldn't be a c model 

[Akbalder]

On 8/27/2018 at 10:14 PM, Magical Duck said:

I think some decoration wouldn't go amiss. Although, then it wouldn't be a c model 

I was talking about adding some decorations using pieces of 42055. I did this:

Edited August 29, 2018 by Akbalder

[BrickbyBrickTechnic]

Looks decent but where did all the geartrains go?

[Akbalder]

6 minutes ago, BrickbyBrickTechnic said:

Looks decent but where did all the geartrains go?

I decided to remove the gears going to the seats (the real ride has no gears to the seats: it allows to create some cool seats rotation speed variations). The structure and each branch rotates.

[BrickbyBrickTechnic]

5 minutes ago, Akbalder said:

the real ride has no gears to the seats: it allows to create some cool seats rotation speed variations)

Very interesting! I can't wait to see a video of it working.

[mocbuild101]

Looks great, especially considering it's a C-model

9 hours ago, BrickbyBrickTechnic said:

I can't wait to see a video of it working. 

+1

[Frequenzberater]

How are you going to realize the lifting of the upper structures? 

[Akbalder]

I updated the first post with images and a video (sorry for the quality of the video ).

 

6 hours ago, Frequenzberater said:

How are you going to realize the lifting of the upper structures? 

There is no lifting. Only rotations.

[m00se]

2 hours ago, Akbalder said:

I updated the first post with images and a video (sorry for the quality of the video ).

 

There is no lifting. Only rotations.

FYI: The ride shown in the video in the first post elevates the 'crosses' a little bit. This mechanism is as far as I know only used on the few rides of this type made by the (long defunct) Belgian company Sobema. The original - and also most common - "Break Dance" is made by the German company Huss and does not have this functionality. Actually your ride is now pretty close to the smaller Break Dance that Huss currently sells (http://www.hussrides.com/en/family-rides/break-dance). Older models had four (and some even six) crosses and had a more intense ride.

[Akbalder]

Thanks for your research ! 

I found this one which works the same way as mine.

[Akbalder]

I think that it is finished. 

 

[m00se]

On 8/30/2018 at 9:25 PM, Akbalder said:

Thanks for your research ! 

I found this one which works the same way as mine.

No research needed, I'm pretty much a walking encyclopedia on those things.

The ride in this video is made by Huss.

[7echn1c]

Cool. When is the deadline?

[Akbalder]

2 hours ago, 7echn1c said:

Cool. When is the deadline?

The deadline has been pushed back to the 7th September.