55cm, char grimpeur

C'est le plus petit char grimpeur que tu as construit ?

Quelle est la largeur du char ? Je pense que cela doit influencer sa stabilité notamment si les obstacles sont irréguliers ( plus haut à droite que à gauche?)

Merci

La largeur est de 34cm.

Je ne sais pas s'il y a un ratio longueur/largeur pour les chars. Peut-être pourrais-tu t'inspirer des schémas des chars militaires.

Je pense que le problème est le couple nécessaire à la rotation. Le ratio longueur/largeur doit avoir une influence sur ce couple, mais à notre échelle, je ne suis pas certain que ce soit très important.

Malheureusement, je n'ai pas la compétence pour faire ce calcul.

Merci.

Hello again and thank you for this. I would like to build this robot but cannot identify all the parts with the three images at the end of the video. I will be using terms used by Lego on their Shop > Pick and Build > Pick a Brick search engine.

Image 1:

In Image 1, there are 2 pieces (A) that look like "1/2 bush"es but with round instead of cross shaped holes. I have been unable to find these on the Lego website. Also, what kind of a band is connecting these 2 parts? There is also a "beam" ( hidden in the frame that I can't see clearly.

Image 2:

You have more pieces (A) in Image 2 which resemble the 2 in Image 1 (A). Are these the same or not? Between the wheels, there's a part ( which I can't make out. Also, 2 more pieces in the frame © look like "bush"es but I can't be sure.

Image 3:

Image 3 shows the back part of the frame. I cannot identify the round part (A) here.

Image 4:

Image 4 shows a armature with wheels which are hard to make out both the assembly connecting the wheels and the connection to the frame.

If you could show the parts I mentioned, the removed assembly from Image 4 without the wheels and also a top view of the frame without the tracks, I would appreciate it very much. Thank you.

Welcome here.

It is better to buy the Lego parts in  BrickLink - Buy and sell LEGO Parts, Sets and Minifigures   instead of Lego shop.

Here are the links for the parts you ask.

Image 1 :

 Technic, Liftarm, Modified Bent Thick 1 x 7 (4 - 4) : Part 32348 | BrickLink

 Wheel 11mm D. x 8mm with Center Groove : Part 42610 | BrickLink

Image 2 :

 Wheel 18mm D. x 8mm with Fake Bolts and Shallow Spokes : Part 56902 | BrickLink

 Technic Wedge Belt Wheel (Pulley) : Part 4185 | BrickLink

 Technic Bush : Part 3713 | BrickLink

 Tire Technic Wedge Belt Wheel : Part 2815 | BrickLink

Image 3 :

 Technic, Pin 3L with Friction Ridges and Center Pin Hole : Part 87082 | BrickLink

Image 4 :

I'll come back soon with the answer.

Sorry, Image 2 wasn't exactly clear. For item 2B, I was asking about the piece BETWEEN the 2 wheels, I think it's the same as 2C but not sure. Also, are you saying that the belt between the 2 wheels in Image 1 are the Tire Technic Wedge Belt Wheels? Thanks again.

Please, always give the references.

- Sorry the part A in image 2 are 42610 not 56902.

- No, the belt 2815 goes only with the wheel 4185.

- yes, in image 2, between  the 2 wheels 4185, there is 2 bushes 3713.

Here is the trolley with his arm. If you don't find the references of parts on Bricklink, please ask.

Please click on me.

Two more things, if I may:

Images 5 & 6:

I don't see any connections between the beam (5A) and the upper beams of the frame or the beams at 6A. I can only assume that they are there and I don't see them.

Also, of the 2 wheels 42610 in Image 1 are not connected by the belt 2815, what are you using?

Thanks again.

One more thing: do you know how many tread pieces were used?

One more thing: do you know how many tread pieces were used?

The 42610 wheels are very cheap. You need about 35, but you can buy 100.

Here is an image with some details.

Click on me.

Don't hesitate to ask.

My apologies: I was asking about the count of piece 3873 and also the connections between part 32278 and the 2 32525 parts in Image 6.

You need about :

- carefull, it is not 3873 but 57518 x 250

- 32278 x 50

- 32525 x 50

If you want, you can talk about you in the presentation section. Et si vous vous présentiez? - Robot Maker (robot-maker.com)

How are part 32278 and the 2 32525 parts in Image 6 connected together?

How are part 32278 and the 2 32525 parts in Image 6 connected together?

With pins ! 

Here are all the pins : BrickLink Reference Catalog - Parts - Category Technic, Pin

But, the most important pins are 2780, 6558, 3673, 32556. You can buy 500 of each.

Are you very beginner in Lego ? 

The 2 wheels (42610) in Image 1A are connected by a yellow band. What is that?

The 2 wheels (42610) in Image 1A are connected by a yellow band. What is that?

It is a rubber band. You can see it working in the video at 2'05".

The trolley has too a rubber from his wheels 42610 to a pin on the chassis. You can see it at the beginning of the video.

OK, all I think I need now is a top-down picture of the whole thing without the tracks on.

Click on me.

Click on me.

Perfect. What motors and remote control parts are you using?