Design and Analysis of the Slider Shear Test System Using Nested GR&R Measurement System

The shear strength of the adhesive bonding between slider and suspension is a vital characteristic for head gimbal assembly. The current shear test method has shown improper failure modes; therefore, a new system has been designed to improve the slider shear test. Six sigma framework was applied to redesign the slider shear test system. The finite element method confirms that new design concept is acceptable because it can yield the correct failure mode of shear test. Next, the measurement errors of the new shear test system are assessed using nested gage repeatability and reproducibility (NGR&R). NGR&R of new shear test system is less than 10% which is an adequate gage. Then, the results of simulation also confirm that decreasing of measurement error can significantly reduce the over reject rate. In conclusion, new shear test system can be effectively used to reflect the real product quality and to obtain more accurate process capability resulting from the correct failure mode of testing