Posted 17 April 2012 - 11:50 PM
Posted 19 April 2012 - 06:01 PM
I am curently working of a concept vehicule for Trial Truck field. I called that "wheeled snake" because it has a articulated body (frame) thanks to multiple 3 dof joins and has of course wheels. A XL motor drives the 3 axles with 3 differentials and the suspensions system is managed with flex hose which enables to have free rotation for steering but strained rotation for other axis.
Basically, the frame "follow" the ground by crawling. Concerning the steering, I have motorized the front axle, the rear axle follows the rotation of the middle frame like a trailer. Regarding the clibing abilities, there are very good thanks to the multiple 3 Dof joins and the steering abilities are much better : turning radius is very small. It is of course possible to duplicate the rear axle to make more rear axle (4 or 5 instead of 3 axle) to have a longer "snake".
I have shooted the video, I an learning at the moment adobe premiere and then I will make the video.
Again, all comments are welcome.
Posted 19 April 2012 - 07:37 PM
Posted 20 April 2012 - 01:48 AM
It's a very interesting concept, and something that I have been thinking about for a little while now too, but I have a few other models to get out of the way before I start on mine.
I'll be watching your progress to see where you go with this concept.
Posted 21 April 2012 - 08:30 PM
I work also on a loom machine, an automated loom which will be displayed at Fanabriques2012. I will talk you about soon.
Posted 29 April 2012 - 07:29 AM
And here are some pictures of the abilities of the vehicle, turning radius and clibbing angles :
And a view of the underneath of the chassis, now equipped with portal axle :
I hope you like the video, I have spend many hours to make it.
Posted 29 April 2012 - 10:01 AM
Are you planning on building a body for this? Even just some sort of roll cage frame would look good.
Do you think this could work with more than three sections? What about a really long one with about 15 sections (with multiple motors)? I think the main problem might be the steering...
PS. I've also started using Premiere for my videos. Once you've used it a few times you'll get used to how it works and be faster. One thing I tend to do when starting a new project is use my previous project as a starting point. That way you can have a lot of your title screen and stuff like that already set up, and you just have to make changes from there.
Posted 29 April 2012 - 05:34 PM
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Posted 29 April 2012 - 08:41 PM
@Tmir : I have used Fraps a free softawre limited at 30 second of shoot. Also, I have used the function "mapping" "trim" and "adjustement of the background" to remove the Fraps inscription and to inlay the rotating rendering of the Crawler (made in SR3D builder).
Concerning the sound, I have mixed some computer noise and atmosphere noise, score of the trailer of Alien VS Predator game (the 3 black screens at the begining) and use a song that Zapac on http://dig.ccmixter.org/ has created for me. Lot of work in some ! More than the Lego creation... ^^
Posted 30 April 2012 - 10:37 AM
Posted 02 May 2012 - 06:28 AM
If wish I could ! I have only two Ball-joins, I must buy 5 unimog ^^
Posted 05 May 2012 - 12:35 PM
To avoid misunderstanding, the photo you show is a prototype version of my crawler. With 2 XL motor for drive and differential steering. The final version don't use this kind of drivetrain. The reasons why are explained on my blog : http://www.nico71.fr/wheeled-snake/
Posted 06 May 2012 - 11:56 AM
Soon, I will present you my work arround my Loom Machine (automated of course), started on Setechnic : http://www.setechnic...97.html#p105697
I have been following SeTechnic about the Loom Machine. It's very impressive how you have build a mechanical loom machine with only one XL motor. Pretty good job. I even like the color scheme!
Did you learn this from your studies (Mechanical Engineering) how to build something like this? Or just from some pictures and YouTube?
Posted 06 May 2012 - 07:12 PM
Concerning the loom, I am just enthousiast of machinery and mechanical engineering (my job) but I have not learnt the principle of loom machine at school but several principle of mechanical movement has been learnt at school. So I have a kind of mechanism culture from my school. The rest is google search :)
Posted 14 May 2012 - 06:29 PM
Caution : heavy post !
I will present you my work around loom machine. First of all, here I am today:
Of course it is not the first attempt, I have made lot of attempt, searches and I present you the first working prototype. To read the complete development, you can read the translated page of setechnic :
The aim is to build for the exhibition Fanabriques 2012 a automated mechanical loom (no RCX-NXT) which is capable of weaving non stop during the exhibition (except maintenance time).
The prototype is quite validated. Concerning the functioning, I encourage you to read the article on Wikipedia : http://en.wikipedia.org/wiki/Loom it explains very well the functioning.
Which is composed of:
1. Wood frame
2. Seat for weaver
3. Warp beam- let off
4. Warp threads
5. Back beam or platen
6. Rods – used to make a shed
7. Heddle frame - heald frame - harness
8. Heddle- heald - the eye
9. Shuttle with weft yarn
11. Completed fabric
12. Breast beam
13. Batten with reed comb
14. Batten adjustment
17. Cloth roll- takeup
My model is a flying shuttle model. Here is the basic cycle of weaving:
- The heddle frames move up
- the shuttle moves from righ to left
- the reed moves and press the weaving pattern
- The heddle frame moves down
- the shuttle moves from left to righ
- the reed moves and press the weaving pattern
Now how I built that. I have first of all build a basic chassis which support all the component:
Then I have put in place a basic system of slider to lead the shuttle :
You can see here the group of reel which composed the 22 thread of the shed.
After that, I have made the system for moving the shuttle called the pitcher (the green liftarms) :
Each pitcher is linked with a rubber band in order to launch the shuttle. To make the movement and tighten the pitcher and the rubber band, I use a cam with variable profile. It is composed of 3 corner 3x3 technic. The last empty corner is to generate the launch of the shuttle :
And in order to have a accurate pitchers, I have made two device of pre-tension. Indeed, the accuracy and velocity of the shuttle linked to the pitcher depend lot of the stretching of the rubber band.
At the end, all setting will be displayed on multiple dials (speed, pre-tension, movements).
Also, after the group of reels, I have made two drums which grip the 22 thread of the shed in order to unroll slowly the shed and to control the tension for the sheed (again important for the functioning).
The crossed reed is used to avoid the snarl.
On the front, it is a big drum which winds the complete weave.
All drums are going to be synchronized in order to have a slowly and constant forward movement.
Concerning the shuttle, it is very simple and yet not so simple. Indeed, the shuttle muste be smooth as possible in order to slide smoothly in the shed (no stop, no clash, no bump). That is why I use liftarms which have rounded shape. On a shuttle, 10m of thread is winded.
Now concerning the « mechanization » of the loom. First of all, a XL motor with 2 8t/40t gear drives the main shaft. The shaft drives after the two system of cam for the pitcher and the system of control the heddle frame. Here is a underneath wiev :
On the right and left view, you can see in blue the mechanism of control of the heddle frame. The system is not based on well-known lever and connecting rod. I use a lever but with a sliding connecting rod, also considered at variable length connecting rod. This system enable to have a output intermittent movement which is better for the application than linear motion.
To finish : the loom works, it works good but not really accurate. I need to improve the accuracy and reliability. The last part of the mechanization is to connect the main reed to press the weaving pattern and after the construction of the dials.
Here is a view of a preliminary weave :
And to finish, a complete view of the loom :
If you have some questions, remarks, comment, don’t hesitate !:)
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