ABMA 15242-2:2016 pdf free

ABMA 15242-2:2016 pdf free.Rolling bearings一Measuring methods for vibration
Other rotational frequencies and tolerances may be used by agreement between the manufacturer and the customer, for example, it may be necessary to use a higher rotational frequency for bearings in the smaller size range (e.g. 3 600 min-1) in order to obtain an adequate vibration signal. Conversely, it may be necessary to use a lower rotational frequency for bearings in the larger size range (e.g. 700 min-1) to avoid possible ball and raceway damage.
Other axial loads and tolerances may be used by agreement between the manufacturer and the customer, for example, depending on bearing design, rotational frequency and lubricant used, it may be necessary to use a higher load to prevent ball/raceway slip or a lower load to avoid possible ball and raceway damage.
Other frequency ranges may be considered by agreement between the manufacturer and the customer in those instances where specific ranges have greater importance to successful operation of the bearing.Common used examples are listed in Table 3.
Changing the frequency of rotation should always come along with a proportional change of the filter frequencies and acceptance limits and minimum measuring time. Examples are given in Table 3.Detection of pulses or spikes in the time domain velocity signal, usually due to surface defects and/or contamination in the measured bearing, may be considered as a supplementary option. Various evaluation methods exist.
All bearings, except for single-row angular contact ball bearings, shall be measured with the axial load applied from one side of the stationary ring and the measurement repeated with the axial load on the other side of the stationary ring. Single-row angular contact ball bearings shall be measured in their foreseen axial load carrying direction only.
The greatest vibration reading for each frequency band shall be within the limits.For diagnostic purposes, performing multiple measurements with the stationary ring in different angular positions relative to the transducer is appropriate. For measurement duration, see ISO 15242-1:2015, 6.5.ABMA 15242-2 pdf free download.