(1)  the measurement of temperature conditions

Measurement provisions of the ambient temperature 20 ℃ , including NSK bearings,guage blocks, standard parts and measuring instruments temperature must be the same, the above put them in the same block of metal plate method can fastest realize the necessary temperature balance, otherwise need several hours or even days to reach such a balance.

In order to obtain the correct measurement results, foreign rely on the mechanization of measurement to avoid contact with these things, or put on heat insulation glove operation.

(2) measurement of the provisions area

For inner diameter of overall bearing FAG or measurement, the domestic regulations of every southern rings in leave for a maximum chamfering coordinates measuring within area, and the abroad many provisions in the two front-runners for the left end for two times each Angle pouring coordinates measuring within area.

(3) the size of the benchmark provisions

By the comparative measurement method in NTN bearing the measure of dimensional tolerance, regulations or standard parts as comparing dosage of the size of the measurement standards, which gauge block must meet the standard JB/T1078 "gauge block" regulation, standard parts must comply with the regulations of the department of factory.

(4) the provisions of the measuring instrument

Measurement in the use of the instrument must be calibrated, and has NACHI bearing and the adaptation of the precision and amplification .

(5) allow the measurement error

In principle can be allowed in the measurement error tolerance to below 10%.

(6) probe radius and meter of the pressure

In order to reduce the measurement error, must be within the range, and strive to reduce the pressure meter-measurement force, and increased the curvature radius of the probe.

In the measurement of the INA bearing diameter and outer diameter, the measurement force and the curvature radius of the probe with reference to select.

(7) measurement of the spindle

In the measurement of the bearing Kia, Kea and Sd project, for cylindrical holes bearing, the heart of the taper in principle axis taper provisions for 1/5000 a l / 10000, for cone bearing hole uranium, the heart of the basic shaft taper provisions for 1/12.

(8) measurement load provisions

When measuring Kia, Kea and Sia, Sea project, need to bring the necessary measuring load, make rolling body and the contact position of the rings in normal, to get the measured value of the stable.

(9) measurement datum rules

 
For general KOYO rolling bearing, take the collar when measuring the print end for datum, to Angle contact ball bearing and taper roller bearings, thrust of end take under load for the datum.



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