Edge break is used to intentionally modify sharp edges on a manufactured part by rounding off a corner with a radius, a fillet or by creating a chamfer. This is to remove any sharp hazardous 

edges or edges that may cause functional issues resulting from the manufacturing process. 

Apart from the question of safety there are many reasons why the measurement of edge break is important. These include part longevity and functionality caused by stress concentration of sharp edges, and potential damage during assembly. Corrosion resistance where small crevices can be present in burs and in aerospace where burrs can affect aerodynamic performance. 

Using a device such as 4D InSpec 3D measurement device or a Bruker Alicona optical metrology allows the rapid, simple, shop-floor measurement of edge break, chamfer angles, and other precision part geometries.  Accuracy, repeatability, reproducibility, and durability make both the 4D InSpec and the Infinite Focus the right tool for measuring edge break in shop-floor environments.

If you are inspecting turbine blades, discs, blisks, nozzles, fasteners or burrs, these edge break measurement tools will provide repeatable results over and over again.