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ABIS Miniature and Precision Ball Bearings

With bores of 0.6 to 90mm and precision grades to ABEC 7

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bearing noise

Bearing acoustical noise is a function of both the bearing itself and the way in which it is used. Bearings can be specified as 100% noise-tested during manufacture. Bearing noise is not generally influenced by ABEC precision, but rather by manufacturers' internal quality standards, particularly raceway finish. There are no fixed reference standards among manufacturers for noise testing.

NOISE TESTING

The standard instrument used for bearing noise testing is the Anderon Meter (sometimes called Anderometer) made by Sugawara Laboratories. This measures noise with an accelerometer contacting the outer race of the bearing while the inner race is rotated at 1,800 RPM. Noise levels are separated into 3 bands, designated as follows: 

High band 1,800 - 10,000 Hz 
Medium band 300 - 1,800 Hz 
Low band 50 - 300 Hz

According to the type of bearing (material and noise grade), a different attenuation is used for each band. Meters are calibrated in Anderons. Standard testing procedure requires that bearings are washed clean of any lubricant and 2 drops of fresh MIL-L-6085A oil lubricant added prior to testing.

Typical attenuation values for each band are given in the table below, according to bearing material and noise grade. A "pass" for any bearing grade is defined as < 40% of full scale on the Anderon meters for each band. In this case, this translates to pass levels of  Low < 6.4, Med < 2.4, High < 3.2.  

Anderon Meter Attenuation Settings

Material

Noise Rating

Low Band

Mid Band

High Band

5100 chrome steel

Standard

16

6

8

EMQ

16

6

8

EMQ2

12

6

8

440C/Martensitic stainless

Standard

16

10

24

EMQ

16

10

24

EMQ2

16

8

10

Anderon Meter <40% = good bearing

 

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