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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Engine The rear wheels are used to drive a V-6 engine. Click for an animation of the compressor in motion. A single compressor is integrated into the body. The compressor cylinder itself looks like a small actuator but has a port only at the head end.

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. But it seems to work fine. Torque from the differentials passes through a long drive shaft to a point under the front lefo the engine. Each pair of pistons shares a common crank pin. Motorized Compressor Feast your eyes on the only Technic pneumatic compressor.

LEGO Air Tech Claw Rig Instructions , Technic

The overhead control drives an axle connected to a pair of 14 tooth bevel gears. Flex system rigid sleeves are used as pneumatic 868 to span the sections between the pneumatic hoses. A vertical axle which connects to the 16 tooth gear drives a horizontal axle which passes through the holes in the upper turntable.

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

The outer angle lsgo the claws is fixed at 90 degrees. Because of the very small area, this actuator has a small output force and the grip of the claw is not very strong, but it does the job. Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw. 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.

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Instructions For LEGO 8868 Air Tech Claw Rig

A belt then actually drives the crankshaft of the engine via a pair of pulleys which increase the rotation about 3 times. The smaller arm allows a greater range of legl in this case almost 90 degrees. 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. Click for an animation of the engine in motion.

The second section is movable and is lifted by a single pneumatic actuator driving another pair of triangles. Selection of the switches in either direction allows pressure to flow to either chamber of the actuators. Because the crank pins are each offset degrees, the forward and back cylinders are synchronized.

Leyo the image to download the LDraw file of this model. Click for an animation of the claw in motion. Wheels and Tires This set uses six of the smaller size foam 20×30 tires and wheels. The color coded computer images can be used to decipher the routing of the hoses in this system, which leyo then be used to derive the logic of this mechanical legp. Extra length is required when at the centered position.

Technic “triangles” are used as lugs to attach to the rod end of the actuator.

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

Pneumatic Claw A grasping claw on the end of the jib lgeo driven by one of the new miniature pneumatic actuators. The second axle drives a pair of 16 tooth spur gears and then the steering rack ,ego an 8 tooth pinion gear.

Why they never used this again is one of the great mysteries and tragedies of our time. 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 actuators are designed to work in compression during their power stroke.

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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.

It 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.

The color coded computer image shows the way the dual pneumatic cylinders are cross connected. The differential ring gears are linked via an axle with 14 tooth bevel gears at either end. This serves to make this model pretty heavy. 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. Since the bottom half of the turntable needs to remain fixed, a unique driving method was required.

The engine is made from cylindrical engine elements. 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 a single hole as a support couple. 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.

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 later. For the first time, a 9V battery box was actually integrated lebo the body of a model instead of being remote.

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