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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The color coded computer image shows the way the dual pneumatic cylinders are cross connected. This makes the engine turn fast. Click the image to download the LDraw file of this model. A pair of rack gears are connected to the actuators and are used to turn a 16 tooth spur gear.

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. The claws are supported by 3 arms which are free to pivot at the ends. Why they never used this again is one of the great mysteries and tragedies legoo our time.

A single compressor is integrated into the body. This allows the claw to remain perpendicular to the ground no matter what the jib angle is. When driven to retract, it forces air out through the port.

LEGO Technic Air Tech Claw Rig (8868)

This way, pressure causes one to extend and one to retract simultaneously. Click for an animation of the jib in motion. The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once. Differentials The dual rear axles are both “live” and use a pair of differential gears which incorporate a leho in 28 tooth ring gear which can work either as a bevel or a spur, similar to the 24 tooth crown gear.

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

Click for leog animation of the compressor in motion. I’m sure no one will have any trouble finding a place to route even more pneumatic hoses!

Click for a high resolution rendered animation of the pneumatic connections. Torque from the differentials passes through a long drive shaft to a point under the front of the engine. 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.

LEGO Air Tech Claw Rig Instructions , Technic

Click for an animation of the claw in motion. While tandem rear wheels would have been nice, there is no way they would have fit into the width of this model. There are five pneumatic actuators which have ports at the head and rod ends to accept input from the switches.

Click for an animation of the differentials in motion. Due to the small gear ratio, it operates very fast. The front of the crankshaft uses a 3 blade rotor as a fan.

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The differentials are made to house 3 of the 14 tooth bevel gears. For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote.

The compressor cylinder itself looks like a small actuator but has a port only at the head end. Pneumatic Claw A grasping claw on the end of the jib is 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 via an 8 tooth pinion gear.

Extra length is required when at the centered position. The actuators are designed to work in compression during their power stroke. This serves to make this model pretty heavy. 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 engine in motion. 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 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.