linear system - Profilex sa

PRECISION SHAFTSCIRCULARITYDefinition: The form tolerance zone is limited in the measurement planeperpendicular to the axis by two concentric circles of distance t.The circularity of the shafts is based on the ISO tolerance system per DIN ISO 286.Circularity of the shaft = 1/2 tolerance range per DIN ISO 286-2Example: Shaft Ø 20 h6 (tolerance range +0 / -13 µm): Circularity = 6.5 µmThe circularity of the shafts is determined using a form measurement machine, the circularity of the shaftsbeing exaggerated in the diagramme shown.CONCENTRICITY (COAXIALITY)Definition: The tolerance zone is limited by a cylinder of diameter t whose axismatches the reference axis.Application: e.g. tapping turn on a shaft.SURFACE QUALITY [roughness]The surface roughness of the ground outer surface of the shell is specified by MiniTec as the Rz value.Ra 0.15 µm to 0.3 µm = Rz 1.25 µm to 2.5 µmTechnically, in practice there are two different roughness measurements in use.Middle roughness Ra: (DIN EN ISO 4287)Arithmetic average of the absolute amounts ofdistance Y of the roughness profile from the middleline within the measurement section.MiddlelineMax. roughness profile height Rz: (DIN EN ISO 4287)The arithmetic mean of the individual roughnessdepths of five adjacent individual measurementsections of equal length.112 MINITEC LINEAR SYSTEM