Faulmaran Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud. A real hydraulic actuator has significantly less output 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 claw can be lowered to grasp the rear bumper to help keep the crane stable when the truck is in transit. It is important to get the two actuators even and centered when rigging the to make sure that it can rotate 90 degrees in either direction. Due to the small gear ratio, it operates very fast.
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Tegami To solve this, the ring gear of the second differential is located on the opposite side. Click for an animation of the jib in motion. The color coded computer image shows the way the dual pneumatic leyo are cross connected. Head end pressure extends the piston, while rod end pressure retracts it.
LEGO Air Tech Claw Rig Instructions , Technic 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.
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 is an integral relief valve which prevents the pressure from building above a safe level, although the torque required to drive the compressor to relief pressure slows the motor considerably.
The compressor cylinder itself looks like a small actuator but has a port only at the head end. This allows the claw to remain perpendicular to the ground no matter what levo jib angle is. Click for an animation of the compressor in motion. One is on each axle, and one planet gear in the middle allows the axles to turn at different rates. The head end of one actuator is connected to the retract port of the other.
The overhead control drives axle connected to a pair of 14 tooth bevel gears. When extending, it draws in air from the atmosphere. Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud. Torque from the differentials passes through a long drive shaft to a point under the llego of the engine. Each pair of pistons shares a common crank pin. 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.
A belt then actually drives the crankshaft of the engine via a pair of pulleys which increase the rotation about 3 times. Since the bottom half of the turntable needs to remain fixed, a unique driving method was required. 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 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. Model by Eric Albrecht. DIN PDF 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.
Because there is continuous supply of pressure, this model operates very smoothly and multiple functions can even be run concurrently. This can be seen clearly in the animation. The engine is made from cylindrical engine elements. A vertical axle which connects to the 16 tooth gear drives a horizontal axle which passes through the holes in the upper turntable.
Click for an animation of the differentials in motion. For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote. The actuator attaches to the middle hinge point of the claw which allows it to drive both sides at once.
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