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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The color coded computer images can be used to decipher the routing of the hoses in this system, which pego then be used to derive the logic of this mechanical computer. The compressor has plenty of pneumatic pressure to lift the boom, even at full extend.

Air Tech Claw Rig | Brickset: LEGO set guide and database

A pair of rack gears are connected to the actuators and are used to turn a 16 tooth spur gear. A single compressor is integrated into the body.

This makes the engine turn fast. This allows them to be clipped to hooks which makes certain that the hoses move with the boom and jib and do not become tangled. The overhead control drives an axle connected to a pair of 14 legk bevel gears. The engine is made from cylindrical engine elements.

LEGO Technic Air Tech Claw Rig (8868)

This allows the claw to remain perpendicular to the ground no matter what the jib angle is. The compressor cylinder itself looks like a small actuator but has a port only at the head end.

But it seems to work fine. While this allows them to rotate at the same rate, it could make one differential rotate backwards. The smaller arm allows a greater range of motion; in this case almost 90 degrees. To solve this, the ring gear of the second differential is located on the opposite side. Because all of the other pneumatic hoses have to pass through the center of the turntable along with the driving axle, the crane can only turn so far before the hoses snag.

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When extending, it draws in air from the atmosphere. The actuators are designed to work in compression during their power stroke. Click for an animation of the loader slewing.

Model by Eric Albrecht. Click for an animation of the jib in motion. A belt then legk drives the crankshaft of the engine via a pair of pulleys which increase the rotation about 3 times.

There’s a legi motor mounted under the battery box which drives a large pulley through a belt. Due to the small gear ratio, it operates very fast. The steering mechanism itself uses steering arms and toothed links as shown in the computer image. A big diesel truck like this would indeed probably have a large displacement 6 cylinder engine although probably inlineso this engine fits very well.

Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw. There is an integral relief valve which prevents the pressure from building above a safe level, although the torque required to drive the compressor to relief pressure slows the motor considerably.

Click for an animation of the claw in motion. The claws are supported by 3 arms which are free to pivot at the ends. Motorized Compressor Feast your eyes on the only Technic pneumatic compressor. When driven to retract, it forces air out through the port. The second section is movable and is lifted by a single pneumatic actuator driving another pair of triangles. Pneumatic Claw A grasping claw on the end of the jib is driven by one of the new miniature pneumatic actuators.

The two cylinder banks have a standard V angle of 90 degrees.

Click the image to download the LDraw file of this model. Incidentally, if you are wondering how long it took me to model all of those pneumatic hoses on the computer, the 868 of time is too long to comprehend.

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Pneumatic Jib The jib has two sections, a fixed section and a movable section. 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. One or two of the pneumatic air tanks which came out years later make great replacements pego the fuel tanks and really bump the functionality up to the next level with a virtually limitless source of pneumatic power.

Torque from the differentials passes through a long drive shaft llego a point under the front of the engine.

Instructions For LEGO 8868 Air Tech Claw Rig

A look at this computer image and those in the above sections will demonstrate that the hose’s path to this actuator is pretty circuitous. Because there is continuous supply 888 pressure, this model operates very smoothly and multiple functions can even be run concurrently. The steering arms may seem small for a model of this size, especially since the weight of 868 model is cantilevered out the wheels via only a single hole as a support couple. Technic “triangles” are used as lugs to attach to the rod end of the actuator.

Why they never used this again is one of the great mysteries and tragedies of our time. This serves to make this model pretty heavy.

The actuator attaches almost half way along the length of the boom. The color coded computer image shows the way the dual pneumatic cylinders are cross connected. The claw can be lowered to grasp the rear bumper to help keep the crane stable when the truck is in transit.