>> P.37
1N=0.102kgf=0.2248lbs.1mm=0.03937inchABCDEFGHIJKLMdmpMean bore diameter in a single plane∆dmpDeviation of mean bore diameter in a single planeCalculated mean value of the maximum and minimum values of the single bore diameter within a radial plane.dmp=dsp max+dsp min2dsp:Single bore diameter in a single planeDeviation of mean bore diameter in a single plane and nominal bore diameter.∆dmp=dmp-dd: ominal bearing bore diameterVdspVariation of bore diameter in a single planeDeviation of the maximum and minimum values of the single bore diameter within a radial plane.Vdsp=dsp max-dsp minVdmpVariation of mean bore diameterDeviation of the maximum and minimum values of mean bore diameter in a single plane, for individual raceway rings with essentially cylindrical bore diameter surfaces.Vdmp=dmp max-dmp min∆dsDeviation of a single bore diameterDeviation of single bore diameter and nominal bore diameter.∆ds=ds-dds:Single bore diameter (distance between two parallel straight lines touching the intersection of the single bore diameter surface and the radial plane)1.2rs max1.2rs maxSingle bore diameterZero the gauge indicator to the appropri-ate size using gauge blocks or a master ring.In several angular directions and in a sin-gle radial plane, measure and record the largest and the smallest single bore diam-eters, dsp max and dsp min, within the mea-suring zone (excluding the zone 1.2 times the respective maximum allowable cham-fer dimensions of the inner ring face).Repeat angular measurements and record-ings in several radial planes to determine the largest and the smallest single bore diameter, ds max and ds min.Table 16 Measurement methods of accuracy of boundary dimensionsMeasurement methodsAccuracy and definitionsMethods of MeasurementMeasurement of IKO Needle Roller Bearings is based on JIS B 1515-1, -2 (Rolling bearings-Toleranc-es). Tables 16 and 17 show some examples of the methods.Special methods are used to measure Shell Type Needle Roller Bearings. Therefore, refer to the section on accuracy for these bearings on page B3.DmpMean outside Calculated mean value of the maximum and minimum values of the single outside diameter within a radial plane.diameter in a single Dmp=planeDsp max+Dsp min2Dsp:Single outside diameter in a single plane∆DmpDeviation of mean outside diameter in a single planeDeviation of mean outside diameter in a single plane and nominal outside diameter.∆Dmp=Dmp-DD:Nominal bearing outside diameterVDspVariation of outside diameter in a single planeDeviation of the maximum and minimum values of the single outside diameter within a radial plane.VDsp=Dsp max-Dsp minVDmpVariation of mean outside diameter∆DsDeviation of a single outside diameterDeviation of the maximum and minimum values of mean outside diameter in a single plane, for individual raceway rings with essentially cylindrical outside diameter surfaces.VDmp=Dmp max-Dmp minDeviation of single outside diameter and nominal outside diameter.∆Ds=Ds-DDs:Single outside diameter (distance between two parallel straight lines touching the intersection of the single outside diameter surface and the radial plane)A34Single outside diameterZero the gauge indicator to the appropri-ate size using gauge blocks or a master.In several angular directions and in a sin-gle radial plane, measure and record the largest and the smallest single outside diameters, Dsp max and Dsp min, within the measuring zone (excluding the zone 1.2 times the respective maximum allowable chamfer dimensions of the outer ring face).Repeat and record measurements in sev-eral radial planes to determine the largest and the smallest single outside diameter, Ds max and Ds min.1.2rs max1.2rs max
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