LEGO 8868 PDF
Released in , set has the first and only motorized pneumatic find on any LEGO® model, and in fact this is the only set with a motorized compressor. Find great deals for LEGO Technic Air Tech Claw Rig (). Shop with confidence on eBay!. Shop LEGO Technic Air Tech Claw Rig. Free delivery and returns on eligible orders of £20 or more.
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A weighted 2×6 brick is located at the back of the crane to act as a counterweight so that the turntable is reasonably balanced.
When driven to retract, it forces air out through the port. This allows them to be clipped to hooks which makes certain that the hoses move 888 the boom lefo jib and do not become tangled. The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once.
For the first time, ldgo 9V battery box was actually integrated into the body of a model instead of being remote. Click for an animation of the differentials in motion. Click for an animation of the jib in motion. Click for an animation of the claw in 886. The two cylinder banks have a standard V angle of 90 degrees.
To solve this, the ring gear of the second differential is located on the opposite side. Incidentally, if you are wondering how long it took me to model all of those pneumatic hoses on the computer, the amount of time is too long to comprehend. Compared with the boom actuator, this one has fairly poor mechanical advantage, but less is legoo due to the decreased moment arm of the lifted load.
The steering mechanism itself uses steering arms and toothed links as shown in the computer image. While this allows them to rotate at the same rate, it could make one differential rotate backwards. The second section is movable and is lifted by a single pneumatic 88868 driving another pair of triangles. Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression. While tandem rear wheels would have been nice, there is no way they would have fit into the width of this model.
Pneumatic Jib Lrgo jib has two sections, a fixed section and a movable section. This can be seen clearly in the animation. Click the image to download the LDraw file of this model.
Because of the very small area, this actuator has a small output force and the grip of the claw is not very strong, but it does the job. Since the bottom half of the turntable needs to remain fixed, a unique driving method was required. The pressure is split and fed to the inlets of four selector valves switches with two outputs each.
Head end pressure extends the piston, while rod end pressure retracts it.
This way, pressure causes one to extend and one to retract simultaneously. The angle of the first section with respect to the boom is about degrees and is locked by lrgo and lift arms.
This gives it excellent mechanical advantage to lift the weight, but also means that the total boom rotation is small; in this case about 45 degrees. The claws are supported by 3 arms which are free to pivot at the ends. Pneumatic Claw A grasping claw on the end of the jib is driven by one of the new miniature pneumatic actuators. Many of these hoses then pass aft through another beam and up through the center of the turntable for the loader.
A real hydraulic actuator has significantly less output force in tension than in compression due to the fact that the annular area of the rod end of the cylinder is less than the full bore area of the head end.
The actuator attaches almost half way along the length of the boom. The differential ring gears are linked via an axle with 14 tooth bevel gears at either end. A big diesel truck like this would indeed probably have a large displacement 6 cylinder engine although probably inlineso this engine fits very well.
LEGO Technic Air Tech Claw Rig (8868)
With a compressor, 4 switch valves, 4 large actuators, one small actuator, and four rigid tubes, there are a total of 23 flexible pneumatic hoses to route through this behemoth. Motorized Compressor Feast your eyes on the only Technic pneumatic compressor.
Because there is continuous supply of pressure, this model operates very smoothly and multiple functions can even be run concurrently. A belt then actually drives the crankshaft of the engine via a pair of pulleys which increase the rotation about 3 times.