NSK bearings rolling product routine check, must be in accord with the conditions specified in the national standard.
(1) the temperature at which the measurement conditions
When measuring the environment temperature is 20 ℃, FAG 6321 bearings http://www.fagbearings-hk.com/product/FAG-6321-bearings-1757.html , gauge block, standard parts and the temperature of the measuring instrument must be the same, the above them on the same piece of metal plate method can fast achieve the necessary temperature balance, or take a few hours or even days to reach the balance.
Abroad in order to get the correct measurements, rely on the measurement of mechanization to avoid hand contact with these things, or wear insulated gloves.
(2) the provisions of the measurement area
NSK 6205 bearings purchase http://www.nskbearings-hk.com/product/NSK-6205-bearings-2195.html for inner or outer diameter measurement, domestic regulations leave the ring on the southern side of one of the biggest chamfering coordinates within the area of measurement, and foreign many regulations to leave the ring twice in two end chamfering coordinates within the area of measurement.
(3) the size of the provisions of the benchmark
NSK bearings in the comparative measurement method for measurement of size tolerance, dosage of rules or standard for comparison measuring the size of the benchmark, the gauge block must conform to the standard JB/T1078 "gage block" regulation, standard parts must comply with the provisions of the competent department of factory.
(4) the provisions of the measuring instrument
Used when measuring instrument must be calibrated and have adapted to NSK bearing http://fagbearings.followmore.com/
measured precision and magnification ratio.
(5) the permissible error of measurement
In principle can allow the measurement error in tolerance of less than 10%.
(6) probe radius and pressure gauge
In order to reduce the measurement error, which must be within the scope of the possible, makes every effort to reduce inventory pressure measuring force, and increasing the measuring head radius of curvature.
When measuring the inner and outer diameter of the NSK bearings, measurement and head of radius of curvature can be used in reference to select.
(7) measurement used in the spindle
NSK bearings in the measurement of the project such as Kia, Kea, and Sd, NSK bearings for cylindrical hole, the taper of taper spindle used stipulation for 1/5000 l / 10000 in principle, for the taper hole uranium bearing, basic taper of the taper spindle used is 1/12.
(8) measuring load regulation
When measuring the Kia, Kea and Sia, Sea project, such as need to impose necessary to measure the load, the rolling body contact with the ring in a normal position, in order to obtain stable measured value.
(9) the provisions of the measuring datum
NSK bearings for rolling average, take ring not print face to measurement datum, NSK bearings for angular contact ball NSK bearings and tapered roller, take take datum of thrust load end.
NSK bearing NSK bearing inspection, don't let exposure to pollutants or moisture environment. If the job is interrupted, should with oil film, paper or similar material by machine.
If don't have to remove and may perform inspection of cleaning without masking of NSK bearings, with coated with brush with petroleum solvent (white spirit) cleaning, then dry with a lint-free cloth or use compressed air to blow dry NSK bearing components (note that don't let the starting rotation).
With a little mirror, and the probe used in the similar to the dentist to check the orbital plane of NSK bearings, retainer and beads. NSK bearings if not damaged, should be provided according to the original machine lubrication instructions or book of 204 pages to 247 pages of execution and lubrication.