LEGO 8868 INSTRUCTIONS PDF

Kejinn Technicopedia: The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once. The two cylinder banks have a standard V oego of 90 degrees. Because there is continuous supply of pressure, this model operates very smoothly and multiple functions can even be run concurrently. Steering, V-6 lwgo, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw. There are five pneumatic actuators which have ports at the head and rod ends to accept input from the switches.

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Kejinn Technicopedia: The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once. The two cylinder banks have a standard V oego of 90 degrees. Because there is continuous supply of pressure, this model operates very smoothly and multiple functions can even be run concurrently.

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

The claws are supported by 3 arms which are free to pivot at the ends. The smaller arm allows a greater range of motion; in this case almost 90 degrees. The second section is movable and is lifted by a pneumatic actuator driving another pair of triangles. 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 Claw A grasping claw on the end of the jib is driven by one of the new miniature pneumatic actuators. Each pair of pistons shares a common crank pin. Torque from the differentials passes through a long drive shaft to a point under the front of the engine. 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.

Click for an animation of the differentials in motion. This allows the claw to remain perpendicular to the ground no matter what the jib angle is. To solve this, the ring gear of legl second differential is located on the opposite side.

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. Extra lsgo is required when at the centered position. For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote. While this allows them to rotate at the same rate, it could make one differential rotate backwards. Click for an animation of the compressor in motion.

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 steering mechanism itself uses steering arms and toothed links as shown in the computer image. When extending, it draws in air from the atmosphere. Head end pressure extends the piston, while rod end pressure retracts it. Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression. Click for an animation of the engine in motion.

Click for an animation of the claw in lrgo. This makes the engine turn fast. Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud. The pressure is split and fed to the inlets of four selector valves switches with two outputs each. Click for an animation of the jib in motion. Engine The rear wheels are used to drive a V-6 engine. A combination of an 8, 24, and another 8 tooth gear pass the torque up without changing the gear ratio or direction. The color coded computer images can lebo used to decipher the routing of the hoses in this system, which can then be used to derive the logic of this mechanical computer.

Compared with the boom actuator, this one has fairly poor mechanical advantage, but less is required due to the decreased moment of the lifted load. Model by Eric Albrecht. Because the crank pins are each offset degrees, the forward and back cylinders are synchronized. Since the bottom half of the turntable needs to remain fixed, a unique driving method was required. The compressor cylinder itself looks like a small actuator but has a port only at the head end.

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 a high resolution rendered animation of the pneumatic connections.

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Why they never used this again is one of the great mysteries and tragedies of our time. For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote. This serves to make this model pretty heavy. Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud.

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