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  • Surface Roughness
    Many parameters can be used to describe surface finishes and these are explained in ISO 4287 and ISO 4288. Those in most common use in the fluid power industry include: Ra, which is defined as the arithmetical mean deviation of the assessed profile. The inch equivalent parameter is CLA (centre line
  • The ABC's of Rz
    Recently an American-based German manufacturer was awarded a contract to produce some parts for a Japanese company. According to the contract, critical surface areas of the parts were to meet roughness criteria as defined by the Rz parameter. This appeared to be no problem, as Rz-mean roughness
  • Medical Device Link .
    CNC machine suited for producing microtitreplate moulds A CNC machining centre is capable of milling hardened steel and achieving an 0.1- um Ra surface roughness. The Evo machine from Kern Micro- und Feinwerktechnik (Murnau-Westried, Germany) can be fitted with a range of accessories and options

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