Nominal Actual Comparison can be used to assess the accuracy, deviation, and tolerance of an object, and identify any errors or defects in its manufacturing process.
Nominal Actual Comparison is a method of comparing the nominal dimensions of an object, such as its design specifications or CAD model, with its actual dimensions, obtained from CT scanning or other measurement techniques. Nominal actual comparison can be used to assess the accuracy, deviation, and tolerance of an object, and identify any errors or defects in its manufacturing process.
Visualising a Nominal Actual Comparison
Most commonly a 3D compare is displayed as a colour map where the colours represent the magnitude of deviation between the reference and measured objects. A colour scale between red and blue is usually used where green lies in the middle identifying areas where there is minimal deviation.
The comparison can also be visualised in 2D where a coloured whisker plot is used.
A porosity is usually an air gap or bubble within a part. Porosities are often unwanted and found commonly in injection moulded or cast parts. A porosity can often be seen as a dark area on a CT slice.
Foam structure analysis is used to better understand and visualise a foam like structure. It can be used to analyse the cell shape, size and distribution as well as the struts which separate the cells.
Digital radiography (DR), is a fast and efficient way to produce high-quality 2D images of objects. Unlike conventional film-based radiography, DR uses digital detectors to capture the X-ray images and display them on a computer screen or store them as digital files.
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