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TOLERANCES - 1

V. Ryan 2007

 

When a product is manufactured in large numbers by batch or continuous production it is almost impossible to ensure that each individually finished product is exactly the same. Each finished product may look the same but there will be very small differences. For example, the boomerang shown below has been manufactured as one in a batch of a thousand. Each boomerang will differ very slightly in its size and shape due to the way it has been manufactured. This is usually the case when manufactured products are made completely by hand or part manufactured by hand.

 
   

When each boomerang is finished it is checked to ensure that each one is as near to the correct size as possible. Each boomerang must fall between two critical measurements for height and length. The height must fall within measurements ‘A’ and ‘B’ and the length within ‘C’ and ‘D’. This is called ‘tolerance’. Any boomerang falling outside either of these sets of measurements is rejected and recycled.

PASS

The boomerang below has passed the tolerance check and it is the right size. This means that it works efficiently and accurately.

 

FAIL

The boomerang below has failed its tolerance check as its measurements are outside the set limits. When tested the boomerang lacked accuracy and failed to work properly.

Checking tolerances is all part of quality control. It is likely that more complicated products will be checked for tolerances several times during manufacture.

     
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