(1) The provisions of the measuring instrument
Used when the measuring instrument must be calibrated, and having to adapt the precision of the measured bearing and enlargement ratio.
(2) allow the measurement error
Can, in principle, allow the measurement error in the tolerance of 10% or less.
(3) the probe radius and the pressure of the measurement table
In order to reduce the measurement error must be within a possible range, strive to reduce the pressure of the measurement table, - the measuring force and increase the radius of curvature of the measuring head.
In the measurement of the inner and outer diameters of the bearing, the measuring force and the radius of curvature of the probe can be used with reference to the selection.
(4) measuring the temperature conditions
Measuring the ambient temperature requirement is 20 ℃, including bearings, gauge blocks, standard parts, and the temperature of the measuring instruments must be the same as above them on the same piece of metal plate can be the fastest way to achieve the necessary temperature balance, otherwise take several hours or even days to achieve this balance.
In order to get the correct measurement results, foreign manpower measurement mechanization to avoid contact with these objects or oven mitts to operate.
(5) measuring region in a predetermined
For the measurement of the bearing inner or outer diameter, the southern end plane of the domestic provisions leave the ferrule are each a maximum chamfer coordinate measurements within the region, while the foreign is defined as more or less away from the ferrule ends face each twice chamfered coordinate region measurements.
(6) the requirements of the size of the base
Measurement Comparative Measurement bearing dimensional tolerances require the amount of blocks or standard parts as a comparative measurement of the size of the base, where the amount of the block must meet the standard JB/T1078 "provisions of the gauge block, standard parts must comply with the manufacturer competent authorities requirements.
(7) was measured with the mandrel
In measuring bearing Kia, Kea and Sd project, cylindrical bore bearings used on the principle of taper of the taper of the mandrel is defined as 1/5000 of a l/10000, tapered bore uranium Order of the tapered mandrel used basic taper predetermined to 1/12.
(8) measuring the load of the predetermined
When measuring Kia, Kea and SIA, the Sea project, the need to exert the necessary measurement load, so that the rolling body and the ferrule is in a normal contact position, in order to obtain stable measured values.


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