Zerobricks

Amazing looks of model team with workings of technic! Superb job!

The differential compares the actual steering angle with a desired one and turns the switch. The M motor does the steering, so you dont need to steer manually (usefull in bigger models like 8466).

Well by upload, there was written which file types were accepted and size. Anyway i'm glad i made it to adult side of the challenge :)

You are a very rich man. In the crane picture, you can see a new gearbox, which i suppose is also used ine excavator tread drive.

Very messy :)

Does anyone have a RC unit with auxiliary output lying around, and doesn't need it. I desperately need it, because mine broke during repair...

Great job! Reminds me of the rescue helicopter lego relased in the 90's. So many functions, and details! The competition is really tough!

You have any video of your automatic machine?

Its not RC, because i dont need for that. Rotors are 'flimsy' because they are held to body in only 2 points, because treads have only 2 axleholes.

This is my entry for the competition. I hope you guys like it! It features motorised contra rotating rotos, joystick control of both rotor assemblies and a rear opening hatch.

I suggest you to use a clucth gear, because a stalled motor can get warm quite fast.

I dont think it would go out much faster than by regular use.

This sensor uses the PF's own weakness for its good. It uses some basic PF parts with a couple of black plates.

Whata bout simply attaching cylinder to a normal lego 3 way valve, and when the pressure is high enough, the valve opens and air escapes...

I found the last few yellow beams, and made the front end prettyer and more yellow-ish :)

The X 16 engine can be seen more detailed here: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=413055 and Comparing pneumatics to LA's, i would say, pneumatics are stronger in this case, because compressor pumps with combination with new tighter tubes generate a lot of force. Linear actuators on the other hand are more rigid, because there is practically no flexible parts unlike compressed air in pneumatics. The problem with using 2 LA's to perform same function is in desynchronisation when stalled. Because no two LA's are same, clutch from one may kick in sooner than other, causing skewing. Pneumatics are self-regulating in that manner. A negative aspect of pneumatics is jerkyness, which is especially evident when lowering ehavy objects. Thats why i used a special air escape sytem, that limits aiflow out of cylinders, when the bucket is lowering. All in all, i think pneumatics are good when you are tight on space for mechanisms, or need longer reaches by combining 2 cylinders. LA's are good for operations, where precision, ireversebility and sturdyness are needed. i spent arround a week building the model from scratch, improvising all the way. The hardest bit was making the bucket tilting mechanisem strong enough, yet able to allow high degree of tilting.

Glad to help you :) We left the moderators quite some work though

And the studded 1x1x1 brick under axle? I used a black one:

Did you use 3/4 pins? NOT the half pins. And did you use 12 tooth gear? Also under axle there is 1x1x1 brick with stud, that keeps it braced.

Its apart now. What is bothering you?

What is bothering you? Its just a 7L beam with few pins. Its same as in LDD except the rack is missing. You can see steering axle here:

Brickshelf: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=417982 LDD file: http://www.brickshelf.com/gallery/zblj/Tri...ns/mini_4x4.lxf

Like i said on brickshelf, the 4L steering rack and the older 4L u joint are missing.

Just download the LDD file and press F7. :)

An idea i got while playing with my pump: