Wednesday, 30 April 2014

What are the Two Methods and Drawbacks of Inspection?

The two methods used in inspection are the sampling inspection and the 100% inspection. Both have drawbacks, which are as follows.

Sampling Inspection
During sampling inspections random samples are taken from several batches of products and inspected. When a defective sample is discovered it is up to the inspector to decide if the entire batch needs to be recovered or rejected. This inspection method is cheap and quicker than the other method as it requires fewer inspectors. The drawbacks of the inspection are:
  • The cost of the production is increased by the inspection but it’s not for its value.
  • This is a partially subjective method as it is often the job of the inspector to decide if the product passes or fails.
  • There is no way of preventing the production of the defective items as the inspection concentrates only on separating the bad items from the good.
  • The inspectors’ judgment might be affected by the monotony of the job and fatigue.
100% Inspection
Strategic points or stages are chosen when careful and detailed inspection takes place during the manufacturing process. The tests are non-destructive and each of the pieces has its own inspection. The costs are increased using this method as more inspectors are required. There isn’t any sampling error but there is the risk of errors being caused by the negligence or fatigue of the inspector.

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