MEASURING INSTRUMENTS CATALOG No.E2016
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L-43LRoundtestTo realize efcient centering and leveling combined with high-precision measurement Mitutoyo operates a policy of continuous improvement that aims to provide the customer with the benet of the latest technological advances.Therefore the company reserves the right to change any or all aspects of any product specication without notice.L-43L■ISO 4291:1985 Methods for the assessment of departure from roundness -- Measurement of variations in radius■ISO 1101:2012 Geometrical product specications (GPS) -- Geometrical tolerancing -- Tolerances of form, orientation, location and run-out0.1 t0.1 t0.1 t0.1tAø0.08A øtø0.08AAøtAø0.08AøtA0.08A tA0.1A tA0.1AtA0.1AtA0.1At DL0.010.11101001000ø1mmø2mmø5mmø10mmø20mmø50mmø100mmø200mm1101001000ø1mmø2mmø5mmø10mmø20mmø50mmø100mmø200mm0.0010.010.111010000.10.20.30.40.50.60.70.80.91DθDeNotation exampleNotation exampleNotation exampleNotationexampleNotation exampleNotation exampleNotationexampleNotationexampleNotation exampleNotation exampleNotation exampleNotation exampleVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentVerication example using a roundness measuring instrumentInspe RoundnessAny circumferential line must be contained within the tolerance zone formed between two coplanar circles with a difference in radii of tTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zoneTolerance zone StraightnessAny line on the surface must lie within the tolerance zone formed between two parallel straight lines a distance t apart and in the direction specied FlatnessThe surface must be contained within the tolerance zone formed between two parallel planes a distance t apart CylindricityThe surface must be contained within the tolerance zone formed between two coaxial cylinders with a difference in radii of t ConcentricityThe center point must be contained within the tolerance zone formed by a circle of diameter t concentric with the datum CoaxialityThe axis must be contained within the tolerance zone formed by a cylinder of diameter t concentric with the datumDatumcenterDatum axisDatum axisDatum axisDatum ADatum axisDatum axisDatum axis PerpendicularityThe line or surface must be contained within the tolerance zone formed between two planes a distance t apart and perpendicular to the datum Circular Runout (Radial and Axial) The line must be contained within the tolerance zone formed between two coplanar and/or concentric circles a distance t apart concentric with or perpendicular to the datum Total Runout (Radial and Axial)The surface must be contained within the tolerance zone formed between two coaxial cylinders with a difference in radii of t, or planes a distance t apart, concentric with or perpendicular to the datum■ Adjustment prior to Measurement CenteringA displacement offset (eccentricity) between the Roundtest's turntable axis and that of the workpiece results in distortion of the measured form (limaçon error) and consequentially produces an error in the calculated roundness value. The larger the eccentricity, the larger is the error in calculated roundness. Therefore the workpiece should be centered (axes made coincident) before measurement. Some roundness testers support accurate measurement with a limaçon error correction function. The effectiveness of this function can be seen in the graph below. LevelingAny inclination of the axis of a workpiece with respect to the rotational axis of the measuring instrument will cause an elliptic error. Leveling must be performed so that these axes are sufciently parallel.Eccentricity versus roundness errorEffect of eccentricity compensation functionRoundness error (µm)Eccentricity (µm)Inclination versus elliptic errorError due to inclination (µm)Inclination (degrees)WorkpieceDiameterWorkpieceDiameter Specied direction: Radial directionDirection that intersects the datum axial straight line and is vertical to the datum axis lineSpecied direction: Axial directionDirection that is parallel to the datum axial straight lineSpecied direction: Axial directionDirection that is parallel to the datum axial straight lineSpecied direction: Radial directionDirection that intersects the datum axial straight line and is vertical to the datum axis lineRoundtest (Roundform Measuring Instruments)Quick Guide to Precision Measuring Instruments

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