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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Because there is continuous supply of pressure, this model operates very smoothly and multiple functions can even be run concurrently. A pair of rack gears are connected to the actuators and are used to turn a 16 tooth spur gear. Wheels and Tires This set uses six lebo the smaller size foam 20×30 tires and wheels.

Click for an animation of the steering in motion.

A vertical axle which connects to the 16 tooth gear drives a horizontal axle which passes through the holes in the upper turntable. Click for 886 animation of the loader slewing. A belt then actually drives the crankshaft of the engine via a pair of pulleys which increase the rotation about 3 times.

Click for an animation of the claw in motion. There’s a 9V motor mounted under the battery box which drives a large pulley through a belt.

8868 The smaller arm allows a greater range of motion; in this case almost 90 degrees. 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.

LEGO Technic Air Tech Claw Rig (8868)

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. While this allows them to rotate at the same leho, it could make one differential rotate backwards.

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The head end of one actuator is connected to the retract port of the other. Click for an animation of the jib in motion. Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud.

The steering arms may seem small for a model of this size, especially since the weight of the model is cantilevered out the wheels via only 88868 single hole as a support couple.

Selection of the switches in either direction allows pressure to flow to either chamber of the actuators. Many of these hoses then pass aft through another beam and up through the center of the turntable for the loader. 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 actuators are designed to work in compression during their power stroke. Click for an animation of the boom in motion.

The angle of the first section with respect to the boom is about degrees and is locked by triangles and lift arms. Click for an animation of the differentials in motion. Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression. 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. Because the crank pins are each offset degrees, the forward and back cylinders are synchronized.

Flex system rigid sleeves are used as pneumatic tubes to span the sections between the pneumatic hoses. 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. Pneumatic Jib The jib has two sections, a fixed section and a movable section. 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.

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Instructions For LEGO 8868 Air Tech Claw Rig

When extending, it draws in air from the atmosphere. This makes the engine turn fast. Torque from the differentials passes through a long drive shaft to a point under the front of the engine. The compressor cylinder itself looks like a small actuator but has a port only at the head end.

Engine The rear wheels are used to drive a V-6 engine. 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.

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

The color coded computer 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. Click for an animation of the compressor in motion. Differentials The dual rear axles are both legoo 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.