Aris

Very nice.

Very nice!

Nice!!

Nice one!

Cool!

Cool!

Indeed! About 100 hours, quite complicated.

Dear all, For the pneumatic contest, I've built a huge robot called ''Nemesis''(from the ancient greek goddess) and I would like to share it with you. Nemesis has 22 pneumatic functions operated by a double compressor. All pneumatic valves are operated only manually according to the competition. Has a weight of 8kg and consists of 8000 lego technic bricks. Total air cylinders : 26 large 11 mini The compressor uses 2 large pneumatic pumps operated by a PF XL motor. The maximum pressure that can be reached by this pneumatic system is 28 psi with fresh batteries. Due to more than 30 pneumatic ''T-air pieces''pressure cannot reach a higher level because there is a huge drag and the XL motor has no power to rotate more. The length of pneumatic tubes are between 0.5 and 1.5 meters long. Due to the large hoses, large air storage is needed because there is a lot of air loss in the system. The air of the whole system is stored inside 2 lego air tanks (although the system needed far more) : The compressor has an auto-pneumatic switch using a large cylinder, which turns the air engine off when the pressure reaches 24 psi. A manometer is used for showing the air pressure at any time. Functions : Nemesis has 2 arms. The bigger front arm has 15 pneumatic functions and the small back arm has 5 pneumatic functions. The small back arm has the following movements : a) small gripper b) elbow1 c) elbow2 d) shoulder e) shoulder rotation The huge front arm has the following movements : a) large gripper, operating 10 fingers independently having 2 mini cylinders each b) wrist, operating 2 functions (up-down and turning) c) elbow d) shoulder e) shoulder turning Besides, the robot has 2 more pneumatic functions : 1) Face movement 2) A third gripper which is mostly for fun (e.g. for scaring house cats) Here is the video of the project : Thanks for watching Good luck to everyone!

Ok...I see. How can I make visible links without having to click on them? Photos have high resolution.

http://www.ebay.com/itm/WI-FI-Dongle-for-Lego-EV3-Intelligent-Brick-mindstorm-s-robot-nasa-education-/251814222096?pt=LH_DefaultDomain_0&hash=item3aa14c1910 This one is bulky but compatible.

Hehe I believe you. Everything depend on willingness Is a crane the most suitable vehicle to support this tremendous amount of functions(32 would be like a record)? Or should you think of another type of machine? Anyway, it's extremely challenging

I totally agree mate, but in case there are functions too far away from the source you should use many gears.That means torque LOSS!! If not, why do we sometimes connect axles directly to the motors for driving vehicles?Try to do this with 30 gears Is it the same? Remember the lego technic crane 42009? Its outriggers stuck due to the enormous amount of gears because the motor is far away from them. Indeed, 32 functions are too many, you would only use them in rare cases. I tried this with 14 functions and was quite hard as for the functionality. That's my opinion!

Very nice idea! But I think that it wouldn't quite work because you have to use a large amount of gears and axles in order to transfer all the 32 funtions to the desired place. Also the torque loss and the space including the functions would be enormous... I am sure that this would work much better with up to 16 funtions.

Yes.The amount of torque coming from this gear ratio with L motor, is aprroximately equal to the limit of axle twisting.

From my experiments, I noticed that the maximum torque applied before an axle starts being twisted is when you have the torque of a large pf motor geared down 9 times(1:9 gear ratio),if this is what you mean.

Does anyone know what's the B model?

The price is around 200 Euros...But definitely it's value for money. http://www.technicbr...14-2h-sets.html The price is around 200 Euros...But definitely it's value for money. http://www.technicbr...14-2h-sets.html

Just Flawless!

Amazing...

On my crane I replaced the L motor with an xl one and there was no problem with friction.

Well done mate excellent project !

Nice mate!