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| CLICK HERE FOR INDEX PAGE |
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| TOLERANCES - 1 |
| V. Ryan © 2007 |
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| 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. |
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| 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. |
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| PASS |
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| The boomerang
below has passed the tolerance check and it is the right size. This means
that it works efficiently and accurately. |
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| FAIL |
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| 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. |
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| 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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| CLICK HERE FOR SECOND 'TOLERANCES' PAGE |
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| CLICK HERE FOR PRODUCT DESIGN INDEX PAGE |
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| CLICK HERE FOR RESISTANT MATERIALS INDEX
PAGE |
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