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TOLERANCES - 2 |
V. Ryan © 2007 |
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Can you imagine if car wheels and tyres were
manufactured without checking tolerances (measurements) ? The car below
has wheels and tyres that should be exactly the same. However, they were
manufactured without tolerance checks being made. As a result the wheels
and tyres are slightly different sizes and the car is dangerous as a
result. |
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The digital vernier caliper is a very accurate
measuring device. It is being used to check that the steel bolt falls
within 81mm and 80mm in length . If it is outside these measurements
(tolerance) it will be rejected. |
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If the measurement falls between -0.5mm less than
80.50mm or +0.5mm above 80.50mm then the bolt is within tolerance and will
not be rejected. Any measurement outside this range and the bolt is
rejected. |
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QUESTIONS |
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1. Explain why tolerance is important when checking the
quality / accuracy of a product. |
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2. If a product or component is rejected because it
falls outside the set tolerance it is normally rejected. Instead of
discarding or dumping the component how could its material be used again ? |
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