Precautions for PCB imposition


1. The outer frame (clamping edge) of the PCB panel should adopt a closed-loop design to ensure that the PCB panel will not be deformed after being fixed on the fixture;

2. PCB panel width ≤260mm (SIEMENS line) or ≤300mm (FUJI line); if automatic dispensing is required, PCB panel width×length≤125mm×180mm;
3. The shape of the PCB board should be as close to a square as possible, and it is recommended to use 2×2, 3×3,……Joint boards; but do not make yin and yang boards;
4. The center distance between small boards is controlled between 75mm and 145mm;
5. When setting the reference positioning point, usually leave a non-soldering area 1.5mm larger than the positioning point around the positioning point;

6. There should be no large devices or protruding devices near the connection points between the panel frame and the internal small board, and between the small board and the small board, and there should be a space greater than 0.5mm between the components and the edge of the PCB board. To ensure the normal operation of the cutting tool;

7. Four positioning holes are made at the four corners of the outer frame of the jigsaw puzzle, with a hole diameter of 4mm±0.01mm; the strength of the holes should be moderate to ensure that they will not break during the process of loading and unloading the board; the hole diameter and position accuracy should be high, and the hole walls should be smooth and hairless ;
8. Each small board in the PCB panel must have at least three positioning holes, 3≤aperture≤6mm, no wiring or patching is allowed within 1mm of the edge positioning hole;

9. For the positioning of the PCB board and the reference symbols for the positioning of fine-pitch devices, in principle, the QFP with a spacing of less than 0.65mm should be set at its diagonal position; the positioning reference symbols for imposition PCB sub-boards should be in pairs Use, arranged at the opposite corner of the positioning element;

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