This image shows in detail the ‘shoulder’ joint i.e. The attachment of the arm to stationary base. The sections of box section are sufficiently far apart in the vertical direction to spread the load of the 1kg mass on the axle. A total of six flange bearings are fitted to the axle to minimise the torque which has to be overcome by the motor which is connected to the axle with a flexible coupling. Flange discs allow the rotation of the axle to result in movement of the arm.
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