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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Many of these hoses then pass aft through another beam and up through the center of the turntable for the loader. The claws are supported by 3 arms which are free to pivot at the ends. Click for an animation of the compressor in motion. Pneumatic Boom The main boom can be legi via a single pneumatic cylinder working in compression.

The compressor cylinder itself looks like a small actuator but has a port only at the head end. Motorized Compressor Feast your eyes on the only Technic pneumatic compressor.

Each pair of pistons shares a common crank 8868. Wheels and Tires This set uses six of the smaller size foam 20×30 tires and wheels. Due to the small gear ratio, it operates very fast. Because the crank pins are each offset degrees, the forward and back cylinders are synchronized. The actuators are designed to work in compression during their power stroke. Engine The rear wheels are used to drive a V-6 engine. Pneumatic Jib The jib has two sections, a fixed section and a movable section. A big diesel truck like this would indeed probably have a large displacement 6 cylinder engine although probably inlineso this engine fits very well.

For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote. But it seems to work fine.

Technicopedia:

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. The differentials are made to house 3 of the 14 tooth bevel gears. The two cylinder banks have a standard V angle of 90 degrees. The color coded computer image shows 886 way the dual pneumatic cylinders are cross connected. Pneumatic Claw A grasping claw on the end of the jib is driven by one of the new miniature pneumatic actuators.

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The steering mechanism itself uses steering arms and toothed links as shown in the computer image. Selection of the switches in either direction allows pressure to flow to either chamber of the actuators. 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.

The steering arms may lgo 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. Model by Eric Albrecht. This makes the engine turn fast. This way, pressure causes one to extend and one to retract simultaneously.

This can be seen clearly in the animation. The front of the crankshaft uses a 3 blade rotor as a fan. Click for an animation of the claw in motion. Technic “triangles” are used as lugs to 88868 to the rod end of the actuator.

The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once. There’s a 9V motor mounted under the battery box which drives a large pulley through a belt. A vertical axle which connects to the 16 tooth lwgo drives a horizontal axle which passes through the holes in the upper turntable. Click for an animation of the engine in motion.

Instructions For LEGO 8868 Air Tech Claw Rig

Why they never used this again is one of the great mysteries and tragedies of our time. Click for an animation of the jib in motion. The overhead control drives legl axle connected to a pair of 14 tooth bevel gears. Since the bottom half of the turntable needs to remain fixed, a unique driving method was required.

One is on each axle, and lebo planet gear in the middle allows the axles to turn at different rates. While this allows them to 88868 at the same rate, it could make one differential rotate backwards.

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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.

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.

Click for an animation of the steering in motion. When extending, it draws in air from the atmosphere. 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. 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. The second section is movable and is lifted by a single pneumatic actuator driving another pair of triangles. A single compressor is integrated into the body. 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.

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. Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw. 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. There are five pneumatic actuators which have ports at the head and rod ends to accept input from the switches.

I’m sure no one will have any trouble finding a place to route even more pneumatic hoses!