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Quality Control (Tolerance (Required Accuracy of a measurement (If they…
Quality Control
Tolerance
Required Accuracy of a measurement
If they aren't parts won't fit together
important dimensions are correct
Just how accurate they need to be specified by tolerance
small margin of error specified by tolerance
small enough not to effect products functionality
Tolerance normally given upper and lower limit
e.g. 20 mm measurement has a lower limit of 19.5mm and upper limit of 20.5 mm
What is it?
Checks the Quality of manufacturing
Made sure made to a high enough standard
usually only sample of materials, components are tested
Quality control Tests
Go/No Go Fixtures check dimensions are within tolerance
Limit gauges- check to see if size is within tolerance
usually double ended - one end machined to lower limit and the other the upper limit
Checks don't take long - much quicker than actually measuring dimensions of component
often used for timber based products
Registration marks check printing plates are aligned
colourful registration mark normally appears as a cross shape
used by manufacturers to check the quality of colour printing onto paper and board
Used to make sure printing plates are aligned in the right position
if plates are in right places
get single clear image
if plates are in wrong places
registration mark will be printed a bit fuzzy