steph77

Steph77's Moc corner

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One stud does make difference! I really dig this machine! :wub:

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Excavator ended perfect :thumbup: small and beautiful :wub:

Enjoy your holidays :classic:

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On 7/21/2019 at 9:54 PM, I_Igor said:

Excavator ended perfect :thumbup: small and beautiful :wub:

Enjoy your holidays :classic:

Thanks guy! I am thinking out what trailer to build. It is not because you are away from your parts that you didn't think to your project...

on one side I have the project to build a trailer to transport the excavator. I even build a prototype of it.

On an other hand as I want to results in a great play set I think to build a standard tilt bed trailer. This way the cycle is complete with the crane filling the trailer and the trailer tilting away the goods out.

.... still wondering what to do.

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Just now, steph77 said:

Thanks guy! I am thinking out what trailer to build. It is not because you are away from your parts that you didn't think to your project...

on one side I have the project to build a trailer to transport the excavator. I even build a prototype of it.

On an other hand as I want to results in a great play set I think to build a standard tilt bed trailer. This way the cycle is complete with the crane filling the trailer and the trailer tilting away the goods out.

.... still wondering what to do.

I'll try to make blue trailer like I posted earlier if I found enough blue panels here in Croatia... and will probably be equipped with Tumbler tires.

Perhaps I'll make something like set 8063

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Posted (edited)

trailer is on the way...

Kz4QnI.jpg

Functions (hopefully):

- 4 Wheels steering connected to the tractor (done)

- Lifting bed (via new rack, done)

- Rigid suspended axle (without shock absorber) (NOOK)

- Automated lock of the tail gate (NOOK)

-Landing gear (manual) (NOOK)

Some other pictures: (i must wait now that legoshop is again avalaible for some parts command)

6lrBCr.jpg

jeRKVb.jpg

As suspentions are not implemented yet, i'll have to rebuilt the whole trailer.

Any idea, comment, are welcome as Always.

Steph

 

Edited by steph77

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Orange and blue looks great together...steering wheels on trailer are great idea like this (craab steering on trailer)

92-SYNTRAC-TIPPER.jpg-nggid0222-ngg0dyn-

To have steering it means that you have separated motor for PTO.

I suppose you use gear racks for steering. Do you have 68.8 x 36 H tires (they would look better IMHO)?

https://www.bricklink.com/v2/catalog/catalogitem.page?P=41893#T=C&C=11

 

 

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Posted (edited)
15 minutes ago, I_Igor said:

To have steering it means that you have separated motor for PTO.

I suppose you use gear racks for steering. Do you have 68.8 x 36 H tires (they would look better IMHO)?

https://www.bricklink.com/v2/catalog/catalogitem.page?P=41893#T=C&C=11

 

 

Oups, no.

I have two separate motors for the two PTO but none of them is used for steering. (1 is for the lifting bed and the other one isn't used actualy)

The steering is linked by rods at the tractor articulation.

Inspired by @MajklSpajkl Moc.

I try to implement this system and managed to have a stable movement only in left/right movement. If the trailer's articulation go up/down or in torsion it has no effect on trailer's direction.

I do not own the 68.8 x 36 H tires, sadly.

 

 

Edited by steph77

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2 hours ago, steph77 said:

 

The steering is linked by rods at the tractor articulation.

Inspired by @MajklSpajkl Moc.

I try to implement this system and managed to have a stable movement only in left/right movement. If the trailer's articulation go up/down or in torsion it has no effect on trailer's direction.

Is it possible to see closeup photo of your solution?

Thanks

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Posted (edited)
On ‎8‎/‎6‎/‎2019 at 1:01 PM, I_Igor said:

Is it possible to see closeup photo of your solution? 

Thanks

Sure!

It took me some time to answer you. It is due to fact I had to finalyse some things on the mechanical POV.

First, I can now check the suspended+direction axles on my checklist ;)

Here are the pictures I take to show the maximum angles and abilities of the model:

AvCcm5.jpg

with steered axles:

ShjblI.jpg

tractor angle + torsion:

Yaq9vV.jpg

and reversed:

N0btk3.jpg

Ok. Now going with the closer asked view. I used lime levers to pop up in the pictures the moving parts involved in the direction system.

The direction is permanent and depending on the angle between the tractor and the trailer. The direction is initiated from the hitch connection. Here under you see the lever system I used to achieve this: when tractor turns to the right side, the lime lever has a forward movement. This movement is then transferred to the two axles.

2QIYvQ.jpg

larger view of the system. The lime lever is connected to a pair of identical levers located in the heart of the axles system. They move correspondingly. As the rotation and articulation points of the axle suspension and direction rods are aligned, they are not parasite direction reaction in case of other angle between tractor and trailer other than left/right movement.

d6k2hn.jpg

top view: on this picture you can see how the lime lever are connected to two rods (one for each axle). The geometry of these rods are different so the front axle steers less than the rear one.

XjaWCE.jpg

Same view with steered axles:

 

FDUZHh.jpg

here is a side view showing the work (the reason I reply not immediately) done on the alignment of the whole rods involved in both direction and suspension movements:

HNZaGZ.jpg

Finally the underside view:

1tibEs.jpg

 

Tell me if other explanations are needed :)

Edited by steph77

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Honestly solution is simple and clever :thumbup:

Now you are "hurrying" me to finish my RC Fastrac and start working in trailer, but I have only 2 blue panels :sad:

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This is tractor is great, and each additional trailer makes it better. The simple steering and suspension system is great, and is a nice addition to the often boring trailer.

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Time for my latest excavator to get it's own video. Enjoy!

 

 

Edited by steph77

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Quote

@steph77 motors in the undercarriage means no 360° rotation of the turret? 

I used a IR receiver located in the understructure. This mean there is a cable going through the turntable, yes.

This cable is long enough to provide up to 4 complete rotation before experimenting troubles.

4 rotations are largely enough for a normal use , simple need to be a little precautionous when using it ;)

I evaluate for a long time the differents options, event if it is not the cleanest one it has its plus and cons.

What decided me to use this setup was not that much the gain of free space but the fact that when rotating, the turret was source of parasite move of the tracks when rotating.

 

Steph

Edited by steph77

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Thanks for sharing the excavator video. It's a joy to see it in action. And of course it would have been fun to design and build it. Great MOC.

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