PCB Tech - Top ten considerations for PCB imposition

1. The outer frame (clamping side) of the PCB jigsaw should adopt a closed-loop design to ensure that the PCB jigsaw 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 jigsaw should be as close to the square as possible, and 2*2, 3*3, …… jigsaw is recommended; but do not put together a yin and yang board;

4. The center distance between the small plates is controlled between 75mm and 145mm;

5. When setting the reference positioning point, usually leave a non-resistance area 1.5mm larger than it around the positioning point;

6. There should be no large devices or protruding devices near the connection points between the outer frame of the jigsaw frame and the inner 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 panel, with a diameter of 4mm±0.01mm; the strength of the holes should be moderate to ensure that they will not break during the upper and lower boards; the precision of the hole diameter and position should be high, and the hole wall should be smooth and hairless

8. Each small board in the PCB puzzle board must have at least three positioning holes, 3≤aperture≤6mm, and no wiring or patching is allowed within 1mm of the edge positioning hole;

9. The reference symbols used for the positioning of the entire PCB and the positioning of fine-pitch devices. In principle, the QFP with a pitch less than 0.65mm should be set at its diagonal position; the positioning reference symbols used for the imposition PCB daughter board should be paired Used, arranged at the opposite corner of the positioning element;
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