I-beam: The group initially utilized a T-beam as the main arm of the crane, which required substantial revision upon testing. Fortunately, the group was able to change their main arm design with knowledge gained from the class to that of an I-beam which provided far more rigidity.

 

Square Truss: The group was very pleased with the performance of the square truss system in terms of its rigidity and its weight.

 

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Hooking Mechanism:The group utilized a simple, but effective hooking mechanism that allowed them to maximize the output torque from the motor. The mechanism consisted of an aluminum strip bent into the shape of a hook attached to the motor's moment arm with a pin that was allowed to pivot freely.

 

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Varied Tensioning Mechanism: The group utilized a tensioned support strut attached to the square truss portion of the crane's structure in order to reduce the deflection of the end of the crane caused by the weight. Although the students initially used a standard support strut in tension, design revision led to the development of the varied tensioning mechanism. The mechanism allowed the group members to keep the strut in tension at all times, and to increase the tension in the strut by tightening the screws in the strut pictured above or decrease the tension by loosening the screws. The group was able to further reduce the deflection at the end of the main arm of the crane by keeping the structure under constant tension, so naturally it was beneficial for the group to have increased control over the amount of tension applied to the crane's main arm.