[HELP] Pneumatic Valves

[DK-Brickfan]

First of all, this is my first post. But I've been looking a long time and are very inspired by sheos RH400

I am working on an excavator with 6 V2 pneumatic pistons for the boom, arm and bucket. And 2 small LA to open the bucket.

Same principle as RH400 and other large excavators.

So far I have made the valve battery with 3 major LA which opens and closes the valves. But it does not work as intended.

So I need ideas for a new valve battery.

I hope you can help me with this project.

Regards Jonas.

[M_longer]

One of LUGPol's administrators has built Terex RH 400 with pneumatics.

It is using four valves, controled by servo motors, each with reduction:

Later version had pressure switches and compressors:

[bonox]

Wow - that's amazing. More than watching it work i'd love to hear it :)

[M_longer]

Wow - that's amazing. More than watching it work i'd love to hear it :)

Whole machine or only valve? :P

[TheItalianBrick]

They are all valid solutions, the main problem with the servos it's the price!!!!

About the LA, why did you not like it? I find it a good solutions cos you can stop it everywhere from closed to open positions.....

[DK-Brickfan]

That´s a pretty amazing unit.

But i´m not a fan of the servo configuration, because of the lack of possibilities.

You can better adjust the air-flow with a LA or some kind of worm-gear.

Oh I liked the LA, but I messed up the connection between the LA and the motor, I used gears instead of U-joint.

I might try to change it, but I would rather look for other ideas and maybe something smaller.

[Alasdair Ryan]

I have made a valve that uses a small gear rack connected to a servo.

Link

[nerdsforprez]

Welcome to the forum! Glad to have you aboard! I can concur what others have said, I think LAs work well with pneumatic valves.

[DK-Brickfan]

Nice set of tanks. :D

I guess you can call it my Worklog of some kind, but i´ve posted som images of my MOC here -

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=559791

And i still need some parts, including the 6 pistons. So i have plenty of time to get the valves, turntable/weight issue, color combination, etc. etc. right. :)

[Saberwing40k]

Here's a link to the valves M_longer is talking about, the builder made some instructions for it.

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=513295

[bonox]

Whole machine or only valve? :P

The pressurised valves working, so in the machine. i kind of have an idea about all sorts of hissing noises, but it might be the steam fanatic in me . But that's a great demonstration of the setup, thanks.

[9v system]

very good idea for a topic. however there is a pneumatic topic that this should be posted in so I will ask Jim to do it

[Rockbrick]

i'd love to see those 'tanks' on a trailer behind the unimog and see it hitting the road

[DK-Brickfan]

I´ve got the PISTONS!

Now it´s time for tweaking and modding the excavator.

More pic´s here -

http://www.brickshel...ry.cgi?f=559791

Edited November 13, 2015 by DK-Brickfan

[jorgeopesi]

Nice machine, I will rebuild my caterpillar 6090 with the same pieces.

[Jim]

I´ve got the PISTONS!

Now it´s time for tweaking and modding the excavator.

Your images is way too big. Can you limit the pictures to 1024 wide, according to site guidelines.

[DK-Brickfan]

I actually dont know how to do that, it´s a link to brickshelf.

[Jim]

I actually dont know how to do that, it´s a link to brickshelf.

Save the picture, upload it to your own BrickSafe or Flickr account, and embed a smaller version.

Otherwise you can simply link the image, instead of embedding it.

[DK-Brickfan]

I think I got it right. :)

[Jim]

I think I got it right. :)

Cool!

I recommend creating a BrickSafe (very easy) or Flickr (widely used) account. It's very useful for hosting your own pictures.