PCB Tech - What are the precautions for PCB jigsaw?

What are the precautions for PCB jigsaw?
The Internet era has broken the traditional marketing model, and a large number of resources have been gathered together to the greatest extent through the Internet, which has also accelerated the development speed of FPC flexible circuit boards, and then as the development speed accelerates, environmental problems will continue to appear in PCB factories. In front of him. However, with the development of the Internet, environmental protection and environmental informatization have also been developed by leaps and bounds. Environmental information data centers and green electronic procurement are gradually being applied to the actual production and operation fields.
Everyone can comment together. Here are 10 things that need attention, please correct me:

1. The outer frame (clamping edge) of the PCB jigsaw should use closed-loop planning to ensure that the PCB jigsaw will not be deformed in the future when fixed on the fixture;

2, the width of the PCB panel is ≤260mm (SIEMENS line) or ≤300mm (the FUJI line); if automatic dispensing is required, the width of the PCB panel is ≤125 mm * 180 mm;

3. The shape of the PCB jigsaw should be as close to a square as possible. It is recommended to use 2*2, 3*3...

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

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

6. There should be no large devices or protruding devices near the connection point between the outer frame of the panel 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 PCB board. To ensure the normal operation of the cutting tool;

7. Four positioning holes are made in 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 there will be no cracks during the upper and lower boards; the precision of the hole diameter and position should be high, and the hole wall should be lubricated and free of burrs. ;

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

10. Large components should have positioning posts or positioning holes, such as I/O interface, microphone, battery interface, micro switch, earphone interface, motor, etc.; quality assurance
iPCB has passed ISO9001:2008, ISO14001, UL, CQC and other quality management system certifications, produces standardized and qualified PCB products, masters complex process technology, and uses professional equipment such as AOI and Flying Probe to control production and X-ray inspection machines. Finally, we will use double FQC inspection of appearance to ensure shipment under IPC II standard or IPC III standard.