A small question of agricultural mechanics ...

Agriculture and soil. Pollution control, soil remediation, humus and new agricultural techniques.
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chatelot16
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by chatelot16 » 12/12/10, 11:56

sacred invention: a four-wheeled cart without direction ... for countries where there are only straight lines
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by dedeleco » 12/12/10, 12:40

In the first beautiful image of Obamot, the rear is not stable and will tip over with the wheels remaining behind.
The front is stable with the horse, the bar which allows to lift the trunk pressing behind the wheels and a good assembly of grelinette which has a good sense of mechanics without simulator.
The simulator is useless if we think about the effects of basic leverage.
At the rear you have to do as at the front with chain which pulls on the bar in lever which also raises the rear when the horse pulls, but it is more difficult, because the chain length between front and rear is at adjust for each length of tree trunk.

Finally there is a direction, because when pulling in a bend, the horse turns the wheels relative to the trunk at the front
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by Obamot » 12/12/10, 14:00

pfff : Cheesy: : Cheesy: : Cheesy: cheerless! Image 8) : Mrgreen:

... I grant you a semi-trailer type joint ... !!!?
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by Christophe » 12/12/10, 15:43

While you are talking, there are some who work and who model on phun.

Result after 30 minutes of learning the software: my first self-gripping clamp under phun: a chain, 1 arms, 2 pivot and 1 breaker to lift.

Image

For the moment, with the default mass and friction parameters, it doesn't hang enough to lift the cube, I need to look in detail ...

Phun has evolved quite a bit since the 2008 topic, there is even water now and every entity has an "energy" (Mr. Kieffer should that!). I really advise we can really do things ... very ... fun ... : Cheesy:
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by Christophe » 12/12/10, 15:48

Hey Hopla, 30 seconds later: 2 steel arms + lighter wooden case = it works :)

Image

: Mrgreen: : Mrgreen:

So much for the principle, now we need to do a cleaner modeling ...
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by Grelinette » 12/12/10, 15:50

dedeleco wrote:...good assembly of grelinette which has a good sense of mechanics without simulator.


thank you thank you dedelco !!! : Oops:
I must admit anyway that I am still working on the precision of the most rigorous pifometer! : Cheesy:
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by chatelot16 » 12/12/10, 16:00

the trinqueballe that I saw was big enough to lift the trunk by the middle, and not let it drag on the ground, so easy to pull and maneuver

is very useful, a good old cart has an axle in the middle, long and narrow, can tip back with the plate touching the ground, and with a hoist system to use the horse's force to pull the ball in.

if the horse pulls on the ball with a rope and your pliers to make go up in the cart, that will not go up, the cart will advance! but with a hoist, not only will it multiply the force, but the fixed point of the hoist will be attached to the front of the trailer, pulling either the trunk which goes up or the trailer which moves back, the trunk will be loaded ... and once the trunk is loaded, it is possible if it is not heavy enough to complete the load with smaller wood
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by Grelinette » 12/12/10, 16:28

Thank you Christophe for your sketches and simulations. Your pliers are nice even if it looks like they are plasticine! : Cheesy:

For the history of the friction forces, the problem does not arise because the end of the pliers is pointed and sinks well into the wood. By cons I am curious to see what will emerge from a simulation with the other system in parallelogram. I tried to understand where the forces are exerted but it exceeds my skills of virtual brain projection! : Cry:

For the history of the transport of branches, the idea of ​​Obamot (the bucket which fits on the toast-balls, which I will write TB), that seems to me very clever (I will see how to adapt it) but for other uses such as transporting tools to the place of skidding (trunks, petrol cans, chains, cords, etc.). A bucket like that would also be too small because the branches (of the pine) make an enormous volume and are sometimes quite long.

I was thinking more simply of a system which would also fit onto the square tubes supporting the wheels, and which would allow a large bundle of branches to be placed above the TB and to tighten with a cord which surrounds the bundle so that it does not picks up. The bases of the branches would therefore be fixed to the TB and the ends would slide to the ground.
Think about it...

I also started to imagine a winch system with concentric tubes fitted at the back of the TB which would not only not modify the current TB but also to fix and remove easily.
I made a sketch that I will scan and mail it to you. It looks quite easy to achieve (like that seen from afar and from a plane!).
It should also exist.

On the other hand, I must tell you that not only do I work with supermarket tools (I can't do big do-it-yourself. If I have to weld I go through an ironworker but it pays), and I always try to do with salvage objects (have you guessed where the bow of the ball toast comes from? ... thank you FT ...). I also try to make easily removable tools for transporting them.
For example, all the TB disassembles to be transported in a car.
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by Grelinette » 12/12/10, 16:46

chatelot16 wrote:the trinqueballe that I saw was big enough to lift the trunk by the middle, ...

You must have seen something like this:
Image

Image
(I still haven't understood the principle of this one! : Shock: )

Image
Nevertheless with my little junk jib I have already moved trunks as big as this one!

Image


But all this material is something else, and anyway it does not fit in the trunk of my car ...
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by chatelot16 » 12/12/10, 17:20

do not bring it back in the trunk ... it must be harnessed behind the car!
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