This is the final design assembly for the crane. The structure is standing on four legs which are flexible and move independantly of each other, offering a stable support especially on uneven terrain. the main boom which will take the load is supported by a cable running from the two supporting Steel I-beams on either side. The eye bolts used with this cable can take maximum 750KG loads each and therfore they are more than suitable for our use. This will help in distributing the load across the 3 beams. the 4 pulley system will be hooked onto the eye bolt which is bolted onto the undersurface of the main boom. The eye bolt can take loads of up to 1.5 tonnes therefore it is more than suited for our 1 tonne max. The pulley system is then connected by means of winch (see previous posts) which has a 10 to 1 ratio.
As these beams will be made from steel, each of the parts on the strucure weighs a comfortable weight for two people to be carrying over short distances. Also this crane will be easy to assembly as it incoperates simple bolts and also benefits from some of the parts coming pre-machined. The legs will be kept secure at the required height by means of pins being threaded through the hole features found on the leg.
Not only do the straight I-beams have support but also the main boom has been modified to include a support system through the square steel tube. With the circular base connected to the underside by means of ball bearing, the structure is able to rotate indipendantly of the underside base.
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