Measuring speed For motor bearings with an inner diameter ≤ 60mm, the set speed is 1800r/min; for bearings with an inner diameter of 65mm～120mm, the set speed is 900r/min. 6 Vibration level 6.1 Vibration (speed) value of deep groove ball bearings 6.1.2 Applicable scope The external dimensions conform to the diameter series 0, 2, and 3 specified in GB/T276-1994, the nominal inner diameter is 3mm～120mm, and the radial clearance conforms to GB/ Deep groove ball bearings with 0, 2, and 3 clearances specified in T4606-2006. Group V is the basic requirement for general bearing vibration (speed), and V is not marked on the bearing; Group V1, V2, V3, V4 are suitable for bearings that require vibration (speed). 6.1.3 For deep groove ball bearings with a measured inner diameter of 3mm～60mm, the vibration (velocity) of a single bearing of different groups should meet the requirements of Table 27. For deep groove ball bearings with an inner diameter of 65mm～120mm, the vibration (velocity) of a single bearing of different groups should meet the requirements of Table 28. Deep groove ball bearing vibration acceleration level limit 6.2.1 Measuring speed For bearings with an inner diameter of ≤60mm, the set speed is 1500r/min; for bearings with an inner diameter of 60mm～120mm, the set speed is 1000r/min. The outer dimension conforms to GB/T276-1994 0, 2, 3 diameter series, the nominal inner diameter is 3mm～120mm, and the radial clearance conforms to GB/T4606-2006 0, 2, and 3 groups of deep groove ball bearings. 6.2.3 Measured value: 6.2.2 Scope of application: See Table 29 and Table 30 for the vibration (acceleration) limits of deep groove ball bearings.