L-27LRoundtestTo realize efcient centering and leveling combined with high-precision measurement Mitutoyo reserves the right to change any or all aspects of any product specication, including prices, designs and service content, without notice.L-27Geometrical tolerances ISO/DIS 1101: 1996*1, ISO 5459*20.1 t0.1 t0.1 t0.1tAø0.08A øtø0.08AAøtAø0.08AøtA0.08A tA0.1A tA0.1AtA0.1AtA0.1At DL0.010.11101001000ø1 mmø2 mmø5 mmø10 mmø20 mmø50 mmø100 mmø200 mm1101001000ø1 mmø2 mmø5 mmø10 mmø20 mmø50 mmø100 mmø200 mm0.0010.010.111010000.10.20.30.40.50.60.70.80.91DθDeNotation 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 instrument 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 datumAdjustment prior to Measurement ISO 4291: 1985*3 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)WorkpieceDiameterWorkpieceDiameterSpecied 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 InstrumentsL
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