NSK import bearing measurement and error criterion

1. The provisions of the size of the benchmark
Comparison method measurement size tolerance seiko import bearings, dose compares the rules or standards of the size of the measurement datum, gauge block must conform to the standard JB/T1078 "gage block" regulation, the standard parts must comply with the provisions of the competent department of the factory.
2. The provisions of the measuring instrument
When using measuring instruments must be calibrated, NSK bearings imported from have adapted to the accuracy of measurement and magnification ratio.
3. The provisions of the measurement area
NSK bearings imported internal or external diameter measurement, a domestic regulations put the ring on the south's largest chamfering coordinate measuring area, many provisions in foreign countries and leave the ring chamfer on both ends of the two coordinate measuring area.
4. Allowed error of measurement SKF Bearings Distributor
In principle the allowed tolerance of measurement error is less than 10%.
5. The measuring head radius and pressure gauge
In order to reduce the measurement error, must be in May, within the scope of the measuring force, makes every effort to reduce inventory pressure, increase the measuring head radius of curvature.
Measurement of internal and external diameter of the bearing NSK import, radius of curvature measurement, can be used for reference
Is bearing installation and acceptance of the method
Check is bearing, the user must have the following knowledge:
(1) bearing inspection according to the standard;
(2) what is project bearing the commodity inspection, why do you want to test these projects;
(3) bearing the quality of the products before inspection, you need to do preparatory work, why want to do these preparations;
(4) bearing all the inspection items of the goods is under what conditions, with what method, what kind of instrument for inspection, inspection results must be within the scope of what kind of tolerance for qualified;
(5) bearing product volume is very big, sometimes not one hundred percent inspection, should adopt what kind of sampling plan, sampling quantity check, can be more comprehensive and reliable enough to represent all bearing the quality of the goods, and check the results according to any standard, to determine this batch of goods qualified batch shall be accepted or rejected batch is rejected.
Bearing acceptance usually divided into three categories, namely:
Routine inspection, bearing general routine check when the arrival of the goods.
Regular check - is the size of the bearing assembly related precision, rotating accuracy, bearing clearance, and bearing the remanent magnetization of inspection items.