ERGONOMIC AND ECONOMIC FACTORS IN AN INDUSTRIAL INSPECTION TASK

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Abstract
Small hooks are being manufactured in large quantities and then cast into sets of between 20 and 40. During manufacture, they are inspected for dimensional accuracy, but the final inspection before casting is entirely visual and designed to detect many types of faults. At present this is done by 100 per cent inspection, followed by a check inspection on small samples. Studies of the performance of the inspectors were undertaken, using batches of hooks containing known types and mixtures of types of fault. These studies showed that the type of fault located first in the batch was reliably detected throughout the batch, whereas other faults of similar magnitude were missed. The implications of this fixation on one type of fault are discussed and applied to a re-design of the inspection scheme to increase its overall efficiency. Applications of the results to the re-design of the methods of training the inspectors are presented.

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