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  • 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
  • Mean Peak to Valley Height (Rtm, Rz)
    such as Rt, Rp or Rv. Rtm is the mean roughness depth. Rtm is equivalent to Rz ISO when more than one sample length is evaluated (typically five). Rtm is equal to the sum of the Rp + Rv values in each sample length divided by the number of sample lengths. Rz = Rtm = Rpm + Rvm. The current ASME/ISO Rz
  • Surface Analysis: Beyond Roughness
    Most discussions on the quality of surface finish revolve around the measure of roughness. Indeed, roughness is the most common measure of surface finish, and parameters such as average roughness (Ra) and mean roughness depth (Rz) are the most commonly specified. But the ways to measure a surface

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