13 May 2009Manufacturing / Production Technology, Hardware & Services
Vitronics Soltec now offers PCB warpage compensation as a feature of its advanced mySelective 6748 selective soldering machines. This compensation ensures that the points to be soldered on an assembly are always the same precise height above the wave, even if there is slight warpage of the board.
A non-contact, highly accurate laser sensor measures the distance between an assembly in-process and the SelectWave prior to soldering. It measures the distance of several target positions on the bottom side of the assembly, while the board is held in the robotic gripper. The operator chooses a reference point near the corner of the board and a measurement point near the middle of the board, and others if needed so that the sensor can take measurements and ‘teach’ itself the board shape and degree of distortion. The system then makes appropriate and precise calculations of Z offset and, when positioning the board for each point to be soldered, ensures that all points are soldered at the optimum height regardless of actual board warpage.
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