It's completed. The final pictures are from a demonstration at the boys lower school.
About this creation
For the latest creation, I have decided to go really big, well as big as my collection of LEGO components will allow me without buying more (although note really true, couldn’t resist buy some more part)! Bricklink here I come (again).
This creation consists of a 14 wheeled chassis with 5 of 7 axles acting as the multi-directional steering for the chassis. The chassis itself is not motorised (not enough large PF motors yet). The overall length of the chassis is 95 studs (760mm) long, 19 studs (150mm) wide and 25 studs (200mm) high to the bottom of the turn table. The length of the turn table section is 71 studs (570mm) long and 44 studs (350mm) wide at the ballast end and 33 studs (260mm) wide along the remaining length. The height of the overall chassis and turntable section is 41 studs (320mm) high. The chassis and turntable weighs 8kg (without the counter balance weights).
Incorporated into the chassis itself are the four stabiliser arms which are controlled from one point on the side turntable area (as shown on the picture below). The four stabilisers extend to maximise the overall stability of the crane. Ideally I would liked to have the extension arms motorised, but no luck this time, more design work required there.
The turntable mechanism for the crane super structure is incorporated into the top of the chassis and can rotate a full 360 degrees. I finalised the design to install PF motors to turn the turn table but had to remove these to as the design of the turntable itself left insufficient room to house the motors. This space was taken up to allow for the beams to attach the turntable to the chassis along with the gearing for the stabilisers. I considered the gearing for the stabilisers to be more important as this assists in locking the stabilisers into position once deployed.
The crane super-structure contains six large PF motors and 1 medium PF motor to control the cable drums for the booms and hooks. All the PF motors are controlled by three IR controllers.
The secondary counterweights are incorporated into the super-structure for the booms. The main counterweights are on the dolly attached to the rear of the main body, these act as the main counter balance for the lifting operation. The main counter weights themselves contain four lead scuba diving weights (weighing 12kg in total). The secondary counterweights section house the two battery boxes for the PF motors.
The boom itself can be configured for either a heavy lift only or a heavy lift capability with the slightly extended height / reach with the boom extension. The PF motors in the super-structure control the lifting/lowering of the main boom and the secondary boom, the main and secondary hooks. The combined weight of the two booms is 2.5kg.
The overall height of the crane is 563 studs (4.5m). The crane has not been tested to see the maximum lifting capacity. For the pictures is was lifting and “I” beam weighing 500g.