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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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.
Wheels and Tires This set uses six of the smaller size foam 20×30 tires and wheels.
LEGO Technic Air Tech Claw Rig (8868)
One or two of the pneumatic air tanks which came out years later make great replacements for the fuel tanks and really bump the legoo up to the next level with a virtually limitless source of pneumatic power.
Engine The rear wheels are used to drive a V-6 engine. 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 two cylinder banks have a standard V angle of 90 degrees. There’s a 9V motor mounted under the battery box which drives a large pulley through a belt.
This gives it excellent mechanical advantage to lift the weight, but also means that the total boom rotation is small; in this case about 45 degrees. Because the crank pins are each offset degrees, the forward and back cylinders are synchronized. Motorized Compressor Feast your eyes on the only Technic pneumatic compressor. Pneumatic Jib The jib has two sections, a fixed section and a movable section. Due to the small gear ratio, it operates very fast. The claw can be lowered to grasp the rear bumper to help keep the crane stable when the truck is in transit.
Each pair of pistons shares a common crank pin. Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw.
Click for an animation of the engine in motion. Flex system rigid sleeves are used as pneumatic tubes to span the sections between the pneumatic hoses. 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.
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.
lsgo A single compressor is integrated into the body. 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 head end of one actuator is connected to the retract port of the other.
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. 886 for an animation of the claw in motion.
This way, pressure causes one to extend and one to retract simultaneously.
When driven to retract, it forces air out through the port. Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression. The smaller arm allows a greater range of motion; in this case almost 90 degrees. Click for an animation of 88668 compressor in motion.
The pressure is split and fed to the inlets of four selector valves switches with two outputs each. The claws are supported by 3 arms which are free to pivot at the ends. The angle of the first section with respect to the boom is about degrees and 8886 locked by triangles and lift arms.
This can be seen clearly in the animation. But it seems to work fine. The outer angle of the claws is fixed at 90 degrees. Click the image to download the LDraw file of this model. The front of the crankshaft uses a 3 blade rotor as a fan. 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 steering in motion.