We can discuss the ah, the following list out of the 10 need to pay attention to, please:
1, PCB plate frame (edge clamping) should be used to ensure the closed-loop design, PCB board fixed on the fixture without deformation;
2, a PCB plate width is less than or equal to 260 (Siemens line) or less than or equal to 300mm (Fuji line) to fight; if there is a need for automatic dispensing, PCB jointed board width x length is less than or equal to 125 mm x 180 mm;
3, PCB fight board shape as close to the square, recommended by 2 x 3, 2 x 3,...... But don't make plywood; Yin and Yang board;
4, the center distance between the control panel between 75 mm and 145 mm;
5, set the benchmark positioning point, usually in the positioning of the surrounding set aside a large 1.5 mm of the non resistance welding area;
6, fight between the plate frame and internal platelet and platelet and platelet connection point near devices or out of the device, and components and the PCB board edge should be kept more than 0.5mm to ensure cutting tool normal operation;
7, in the fight at the four corners of the frame to open a four positioning holes, 4mm aperture + 0.01 mm; hole strength should be moderate, to ensure that in the process of plate do not break; pore size and position precision to high, hole wall is smooth without burrs.
8, PCB spell plate of each boss must have at least three locating holes, 3 is less than or equal to diameter is less than or equal to 6 mm, edge positioning holes within 1 mm does not allow wiring or patch;
9, used for PCB whole plate localization and for fine pitch devices positioning datum mark, the principle on spacing less than 0.65mm QFP should be in the diagonal position of the set; for the imposition of the PCB daughterboard locating datum symbol should be used in pairs arranged on the diagonal elements of the position;
10, large components should be left with a positioning column or positioning holes, focusing on such as I/O interface, microphone, battery interface, micro switch, earphone interface, motor, etc.;