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A method and apparatus to calibrate a bearing pre-load comprises a load cell with strain gauges attached.
English (United States)
This text was extracted from a PDF file.
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Bearing Pre-Load Calibrator
A method and apparatus to calibrate a bearing pre-load comprises a load cell
with strain gauges attached.
The load cell 1 comprises a body portion 2 designed so that the load cell can
replace the bearing for testing. The body portion 2 has a number of strain
gauges 3, preferably in a bridge configuration, fixed in position to monitor the
strain produced in body portion 2.
In operation, the load cell 1 is first calibrated by using the strain gauge bridge
to measure strain or deflection in body portion 2 as a function of the loading. By
the use of an ampli- fier and a digital voltmeter, the output voltage can be
observed directly and correlated to the load to produce a calibration curve. By
proper choice of components, the sensed voltage is linear in the load range of
To check or calibrate the pre-load mechanism 6, the load cell 1 replaces the
bearing on mandrel 7 and the pre-load mecha- nism is actuated. The pre-load
force can then be determined by the observed voltage on a digital voltmeter.