Robotic Crane- by Bashir7
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This robot is able to lift a weight of about 900 grams. I used two big padlocks, shown in one
of the pictures as weights for my crane. The robot is driven forwards and backwards by two 
motors placed on each side of the robot. The motors each turn a worm gear which causes an 8t 
gear to turn, Then a series of gears transport the power two the 4 solid wheels on the bottom
of the crane. I used a buggy motor (which comes with the Mobile crane) to turn the cable 
and lift the weights. The buggy motor goes through a 8 times gear reduction. The a system of 
double pulley further increases the torque.
To save time The crane goes forward and lifts the weight at same time. When the weight is
lifted 40 cm, The weight is lowered.The total time it takes for the crane to finish its job
is 32 seconds(a total distance of 40 cm).