Hot answers tagged pneumatic
In the UK shop, there are currently two sets: The Unimog U 400 [set:8110] which uses the motorised "compressor" to supply the power (as opposed to the manual sprung pump). And the Tractor with Log Loader [set:8049] which uses the manual pump: The other sets that look like they have piston arms (such as [set:8043]) are actually using "linear actuators",...
The set that had the most pneumatic cylinders was the Lego Technic Backhoe, with something around 10. Unfortunately, this set is discontinued. You can, however, buy it on Bricklink. It is, by far, the coolest pneumatic Lego set ever released.
From the post about Vertigo (the precursor to Rory's answer), TrilogyGlenIvy (the creator) stated: Suction cup hangers were easily located in stores. Drilling a small hole and inserting a short section of copper tubing (1/8 “ or ~3 mm diameter) along with some vinyl glue produced the feet that I used. Basically they are usually found in DIY/Home stores ...
This is one half of a "hydraulic" cylinder used like in the bucket of 7685-1: Dozer. This element is Fric. Element, Cylinder and used often used in combination with Stick 6M W/Flange
The parts become leaky due to the seals inside the pistons deteriorating. Typically, the seal is made with an "o-ring" - a circular rubber band (cross section as well as the shape) - if this is the case in the LEGO pistons, and then it's possible the o-rings are made with similar rubber to the LEGO rubber bands, and then they will deteriorate over time in ...
You will not destroy the air tank using standard LEGO components. I don't know what it's structural limits are, but I can tell you that the weakest link in the pneumatic system in my experience is the connection between the rubber pneumatic tubes and plastic inlets. Under high pressure, the tubes will simply pop off before any of the components will actually ...
Apprently, it is possible to generate up to 37psi with LEGO pneumatics parts only. LEGO penumatics can withstand more, however. Engines similar to the one you want to build can work with a recommended pressure intake of 90psi; a maximal (but not recommended) of 120psi is mentionned. So I think it all boils down to the pressure your N2 or CO2 tanks can ...
Since the compressor produces compressed air, it would certainly work, given you build adequate fittings and take precautions against overpressurization. LEGO pneumatics have been tested to withstand as much as 8 bars or 120 psi, but you definitely should plan with safety margins. If your compressor can produce higher pressures, I'd suggest building in some ...
In this discussion at LUGNET the conclusion seems to be that you could use dry graphite if you are comfortable with graphite powder everywhere. Else you should try lithium grease or canola oil. There is also a serious warning about using hydrocarbon oils that could damage the rubber seals inside pistons and the rubber air tubes. One poster also noted that ...
It's difficult to suggest parts without knowing what sets are in your collection. Here are some thoughts to help with assembling this project. Notice that the snake consists of the following pattern: float tube -> pump section -> float tube The float tubes are the elements that keep the heavier pump sections afloat. You'll need something similar to ...
The pneumatic system's limit is three bar (40psi). After that point, the hoses will pop off the ports. I don't think you could explode the airtank very easily with a real compressor. My guess is that it would start deforming around the 5-10 bar range, and only explode once it was bordering on spherical :P.
An air tank (at least LEGO low capacity ones) are not meant to directly supply actuators. Their main purpose is to smooth out the pressure of air flow produced by a pump (manual or motorized).
I was going to recommend lubricating the pistons, but seeing you already did exactly that, I can only say you should try to isolate the source(s) of the problem. Since you have at least one working cylinder, the compressor and the feed tubes should be all right. This leaves the following possible points of failure: switches, subsystem hoses, working ...
Screwjacks! Key components would be Technic, Gear Rack 1 x 4 and Technic, Gear Worm Screw Application of said parts are left as an exercise for the reader, though since OP says they're not using Technic, this might be a moot answer.
Definitely Vertigo III - superb build project
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