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Test & measurement


tolerances. By having machinery to quickly and precisely check parts against the specified dimensions, parts can be made to very tight tolerances and kept under control with in-process inspection.


Coordinate measuring maChine


A coordinate measuring machine (CMM) — like the one found on Pailton Engineering’s factory floor — is a device that measures the geometry of physical objects. The CMM works by sensing discrete points on the surface of the object with a probe. These probes can vary in type, such as mechanical, optical, laser, and white light. Older CMM machines use manually


controlled probes, whereas new technology, like the one used at Pailton Engineering to measure its steering system parts, uses computer- controlled probes.


Faro arm


The Faro Arm is similar to the CMM, but is a portable coordinate measuring machine (PCMM). Whereas traditional CMMs use a probe that moves on three Cartesian axes to measure 3D geometry, PCMMs use articulated arms to enable complete freedom of


movement around a test part. This gives more measuring flexibility for complex parts, where three axes of movement may not be sufficient.


Brinell hardness maChine


While the previous machines have focused on dimensional consistency, there are other characteristics that must be standardised to ensure quality control. This includes how hard the material of a part is. Hardness is a characteristic of a


material defined as the resistance to indentation. This is determined by measuring the diameter of an indentation after a fixed force is applied. The smaller the indentation, the harder the material. The Brinell hardness machine allows


Instrumentation Monthly November 2018


engineers to check all parts in each batch are of the correct hardness. Brinell test machines use a very high- test load of around 3,000kg and a 10mm diameter indenter so that the resulting indentation averages out most surface and sub-surface inconsistencies. These are five ways of ensuring


military vehicle steering parts are made to very tight tolerances. While some techniques use light, such as the shadowgraph, others use physical force as seen with the Brinell hardness test. These testing techniques enable the


best military vehicles to be brought to market, meaning the latest embedded technology is built on high quality, consistent hardware.


Pailton Engineering pailton.com


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The testing techniques employed by Pailton Engineering enable the best military vehicles to be brought to market


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