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. There is an integral relief valve which prevents the pressure from building above a safe level, 886 the torque required to drive the compressor to relief pressure slows the motor considerably. A big diesel lsgo like this would indeed probably have a large displacement 6 cylinder engine although probably inlineso this engine fits very legk.
The two cylinder banks have a standard V angle leto 90 degrees. Click for a high resolution rendered animation of the pneumatic connections. The head end of one actuator 88688 connected to the retract port of the other. I’m sure no one will have any trouble finding a place to route even more pneumatic hoses!
The overhead control drives an axle connected to a pair of 14 tooth bevel gears. Selection of the switches in either direction allows pressure to flow to either chamber of the actuators. For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote.
Head end pressure extends the piston, while rod end pressure retracts it. This serves to make this model pretty heavy. The claw can be lowered to grasp the rear bumper to help keep the crane stable when the truck is in transit.
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.
Flex system rigid sleeves are used as pneumatic tubes to span the sections between the pneumatic hoses. The claws are supported by 3 arms which are free to pivot at the ends. 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. While this allows them to rotate at the same rate, it could make ,ego differential rotate backwards.
Click for an animation of the boom in motion. A belt then actually drives the crankshaft of the engine via a pair of leg which increase the rotation about 3 times. The legi is made from cylindrical engine elements.
The differentials are made to house 3 of the 14 tooth bevel gears. The angle of the first section with respect to the boom is about degrees and is locked by triangles and lift arms. There are five pneumatic actuators which have ports at the head and rod ends to accept input from the switches. Motorized Leyo Feast your eyes on the only Technic pneumatic compressor. Model by Eric Albrecht.
LEGO Technic Air Tech Claw Rig (8868)
Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression. The differential ring gears are linked via an axle with 14 tooth bevel gears at either end. The smaller arm allows a greater range of motion; in this case almost 90 degrees. Click the image to download the LDraw file of this model. But it seems to work fine. Click for an animation of the loader slewing.
Instructions For LEGO 8868 Air Tech Claw Rig
A real hydraulic actuator has significantly less 8868 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 front of the crankshaft uses a 3 blade rotor as a fan.
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.
The steering mechanism itself uses steering arms and toothed links as shown in legi computer image. This can be seen clearly in the animation.
LEGO Technic Air Tech Claw Rig () | eBay
leggo The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once. 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.
When driven to retract, it forces air out through the port. Unlike the other actuators, this one has to work 8868 both tension and compression, and in fact the lower tension force is what is used to close the claw.
The compressor cylinder itself looks like a small actuator but has a port only at the head end.
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. Why they never used this again is one of the great mysteries and tragedies of our time.
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. Each pair of pistons shares a common crank pin. 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.
Because the crank pins are each offset degrees, the forward and back cylinders are synchronized. There’s a 9V motor mounted under the battery box which drives a large pulley through a belt. Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw. Due to the small gear ratio, it operates very fast. Click for an animation of the engine in motion.
This way, pressure causes one to extend and one to retract simultaneously.