Measure for Measure
2002
Column: Measure for Measure: Mass Measurements
Consumers don't need to know about buoyancy
How to measure mass while allowing for water or air...
Masses and weights.
Influences to consider when refining measurements
The unknown weight is compared with a known weight (calibrated by reference to the IPK). An electromagnet (solenoid) is used to provide an equal and opposing force to the weight on the pan and restores the pan position to a neutral or centered value as de...
Column: Measure for Measure: Choose Your Words Carefully
We need to be more precise when talking about specifications and tolerances
We need to use more precise language when we talk about specifications and tolerances. The results are often important or even crucial, yet the words we use are approximate and sometimes just incorrect.
More frequent...
Column: Measure for Measure: How Flat Is Flat?
Two common methods can measure surface plate flatness, but not without problems
Measuring flatness of surface plates and repairing worn ones are a thriving business. The surface plate is a tool universally used in machining and manufacturing, and any shop will have one or more....
Column: Measure for Measure: Meeting Specifications
Compensate for measurement error in test results
Particular specifications may be critical to the customer's uses, but the resolution given is less than the manufacturer's instruments provide, as when the specification reads 3.5 but the instruments can measure 3.4999. To what extent can one...
Column: Measure for Measure: Measuring for Keeps
Measurement uncertainty can be determined, even in destructive testing...
Uncertainty and destructive testing.
Measurement uncertainty can be determined, even in destructive testing
The fundamental principle of measurements, one I've discussed many times in this column, is that measurement uncertainty can be determined in most situations. If the process of measurement does not affect the item being measured, repeated measurements of ...
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