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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Click for an animation of the compressor in motion. This allows the claw to remain perpendicular to the ground no matter what the jib angle is.

The actuators are designed to work in compression during their power stroke. Steering, V-6 engine, llego differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw.

LEGO Air Tech Claw Rig Instructions , Technic

Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud. Due to the small gear ratio, it operates very fast. This can be seen clearly in the animation.

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. One is on each axle, and one planet gear in the middle allows the axles to turn at different rates.

The compressor has plenty of pneumatic pressure to lift the boom, even at full extend. The claw can be lowered to grasp the rear bumper to help keep the crane stable when the truck is in transit.

The pressure is split and fed to the inlets of four selector valves switches with two outputs each. 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. Click for an animation of the claw in motion.

Instructions For LEGO 8868 Air Tech Claw Rig

The front of the crankshaft uses a 3 blade rotor as a fan. Model by Eric Albrecht. Because the crank pins are each offset degrees, the forward and back cylinders are synchronized.

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Legp is important to get the two actuators even and centered when rigging the system to make sure that it can rotate 90 degrees in either direction. There’s a 9V motor mounted under the battery box which drives a large pulley through a belt. The second axle drives a pair of 16 tooth spur gears and then the steering rack via legi 8 tooth pinion gear. The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once.

The claws are 88868 by 3 arms which are free to pivot at the ends. For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote. Extra length is required when at the centered position.

LEGO Technic Air Tech Claw Rig () | eBay

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

The overhead control drives an axle connected to a pair of 14 tooth bevel gears. While this allows them to rotate at the same rate, it could make one differential rotate backwards. This makes the engine turn fast.

When driven to retract, it forces air out through the port. Click for a high resolution rendered animation of the pneumatic connections. Many of these hoses then pass aft through another beam and up through the center of the turntable for the loader. One or two of the pneumatic air tanks which came out years later make great replacements for the fuel tanks and really bump the functionality up to the next level with a virtually limitless source of pneumatic power.

Since the bottom half of the turntable needs to remain fixed, a unique driving method was required. Pneumatic Claw A grasping claw on the end of the jib is driven elgo one of the new miniature pneumatic actuators. The outer angle of the claws is fixed at 90 degrees. A combination of an 8, 24, and another 8 tooth gear pass the torque up without changing the gear ratio or direction. This gives it excellent mechanical advantage to lift the weight, but also means lgeo the total boom rotation is small; in this case about 45 degrees.

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Click for an animation of the steering in motion. Wheels and Lefo This set uses six of the smaller size foam 20×30 tires and wheels. A real hydraulic actuator 88868 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.

Technic “triangles” are used as lugs to attach to the rod end of the actuator. Unlike the other actuators, this one has to work in both tension and compression, and in fact the lower tension force is what is used to close the claw. The color coded computer image shows the way the dual pneumatic cylinders are cross connected. But it seems to work fine. Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression.

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. Click for an animation of the engine in motion. The smaller arm allows a greater range of motion; in this case almost 90 degrees. Each pair of elgo shares a common crank pin. The actuator attaches almost half way along the length of the boom.

The head end of one actuator is connected to the retract port of the other. The two cylinder banks have a standard V angle of 90 degrees.