(1) Measurement of temperature
Measurement of ambient temperature requirements to 20 ° C, bearings, gauge blocks, standard parts and measuring instruments, temperature must be the same, these put them in a metal plate, the fastest way to achieve the necessary balance of temperature, otherwise take several hours or even days in order to achieve such a balance.
In order to get the correct measurement results, and abroad rely on the mechanization of measurements in order to avoid manpower contact with these objects or to wear insulated gloves to operate.
(2) Measurement of the provisions of the regional
The bearing bore or outside diameter measurement, within the domestic regulations in the southern end of the leave rings face each one of the largest chamfer coordinates regional measurement, and abroad, and more regulations to leave the ring at both ends of the surface of each region within the two chamfer coordinates measurements.
(3) Size of benchmark requirement
Measurement of the bearings dimensional tolerances, the provisions of the amount of block or standard as the basis of comparative measurement of the size of gauge block must comply with the provisions of the standard JB/T1078 "gauge block", the standard must comply with manufacturer the competent department in the Comparative Measurement requirements.
(4) The provisions of measuring instruments
Used in the measurement instrument must be calibrated and has to adapt to the accuracy of the measured bearing and zoom ratio.
(5) Allowing the measurement error
In principle allow the measurement error less than 10% of tolerance.
(6) Of the probe radius and the pressure of the meter
In order to reduce measurement error to the extent possible, seek to reduce the pressure meter - measuring force and increase the radius of curvature of the probe.



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