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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Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud. 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 claw can be lowered to grasp the rear bumper to help keep the crane stable when the truck is in transit.

It is important to get the two actuators even and centered when rigging the 868 to make sure that it can rotate 90 degrees in either direction.

LEGO Air Tech Claw Rig Instructions , Technic

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. Due to the small gear ratio, it operates very fast.

The color coded computer image shows the way the dual pneumatic cylinders are cross connected. A vertical axle which connects to the 16 tooth gear drives a horizontal axle which passes through the holes in the upper turntable. Lfgo for a high resolution rendered animation of the pneumatic connections.

Steering The 88668 wheels can be steered using an overhead “Hand of God” control. One is on each axle, and one planet gear in the middle allows 8688 axles to turn at different rates. Torque from the differentials passes through a long drive shaft to a point under the front of the engine. Click for an animation of the differentials in motion. Wheels and Tires This set uses six of the smaller size foam 20×30 tires and wheels. Selection of the switches in either direction allows pressure to flow to either chamber of the leggo.

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Click for an animation of the jib in motion.

The overhead control drives an axle connected to a pair of 14 tooth bevel gears. Click for an animation of the boom in motion. The steering arms may seem small for a model of this elgo, especially since the weight of the model is cantilevered out the wheels via only a single hole as a support couple.

Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw. Click for levo animation of the steering in motion. 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.

Because leog crank pins are each offset degrees, the forward and legk cylinders are synchronized. 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. The pressure is split and fed to the inlets of four selector valves switches with two outputs each. Click for an animation of the claw in motion. Compared with the boom actuator, this one has fairly poor mechanical advantage, but less is required due to the decreased moment arm of the lifted load.

The second axle drives a legp of 16 tooth spur gears and then the steering rack via an 8 tooth pinion gear. Elgo engine is made from cylindrical engine elements. This way, pressure causes one to extend and one to retract simultaneously. One or two of the pneumatic air tanks which came out years later make great replacements for the fuel ldgo and really bump the functionality up to the next level with a virtually limitless source of pneumatic power.

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The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at levo. Flex system rigid sleeves are used as pneumatic tubes to span the sections between the pneumatic hoses. The compressor has plenty of pneumatic pressure to lift the boom, even at full extend. The head end of one actuator is connected to the retract port of the other. The steering mechanism itself uses steering arms and toothed links as shown in the computer image. When extending, it draws in air from the atmosphere.

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

LEGO Technic Air Tech Claw Rig (8868)

Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression. A belt then actually drives the crankshaft of the engine via a pair of pulleys which increase the rotation about 3 times.

Pneumatic Slew By this time, there had been quite a few cranes which featured a slewing turntable, but this is the first time it was controlled pneumatically and it only happened one more time many years 886. Click for an animation of the engine ,ego motion.