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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Each pair of pistons shares a common crank pin. Differentials The dual rear axles are both “live” and use a pair of differential gears which incorporate a built in 28 tooth ring gear which can work either as a bevel or a spur, similar to the 24 tooth crown gear. Selection of the switches in either direction allows pressure to flow to either chamber of the actuators.

Flex system rigid sleeves are used as pneumatic tubes to span the sections between the pneumatic hoses. Click for an animation of the engine in motion.

Technicopedia:

When extending, it draws in air from the atmosphere. Pneumatic Claw A grasping claw on the end of the jib is driven by one of the new miniature pneumatic actuators. A big diesel truck like this would indeed probably have a large displacement 6 cylinder engine although probably inlineso this engine fits very well. Because there is continuous supply of pressure, this model operates legi smoothly and legoo functions can even be run concurrently.

LEGO Technic Air Tech Claw Rig (8868)

While this allows them to rotate at the same rate, it could make one differential rotate backwards. The second axle drives a pair of 16 tooth spur gears and then the steering rack via an 8 tooth pinion gear. A pair of rack gears are connected to the actuators and are used to turn a 16 tooth spur gear. The two cylinder banks have a standard V angle of 90 degrees. This allows the claw to remain perpendicular to the ground no matter what the jib angle is.

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Since the bottom half of the turntable needs to remain fixed, a unique driving method was required.

Instructions For LEGO 8868 Air Tech Claw Rig

For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote. Torque from the differentials passes through a long drive shaft to a point under the front of the engine. The color coded 8688 images can be used to decipher the routing of the hoses in this system, which can then be used to derive the logic of this mechanical computer. 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.

A vertical axle which connects to the 16 tooth gear drives a kego axle which passes through the holes in 868 upper turntable. 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.

The actuators are designed to lgo in compression during their power stroke. Click for a high resolution rendered animation of the pneumatic connections. This serves to make this model pretty heavy. Engine The rear wheels are used to drive a V-6 engine.

A combination of an 8, 24, and another 8 tooth gear pass the torque up without changing the gear ratio or direction. Due to the small gear ratio, it operates very fast.

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To solve this, the ring gear of the second differential is located on the opposite side. Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression.

The pressure is split and fed to the inlets of four selector valves switches with two outputs each. The engine is made from cylindrical engine elements. Compared with the boom actuator, this one has fairly poor mechanical advantage, but less lfgo required due to the decreased moment arm of the lifted load.

Head end pressure extends the piston, while rod end pressure retracts it. The differential ring gears are linked via an axle with 14 tooth bevel gears at either end.

Steering The front wheels can be steered using an overhead “Hand of God” control. The outer angle of the claws is fixed at 90 degrees.

The color coded computer image shows the way the dual pneumatic cylinders are cross connected.

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

Technic “triangles” are used as lugs to attach to the rod end of the actuator. A real hydraulic actuator has significantly less output force in tension than in lrgo 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.

Extra length is required when at the centered position.