1. PCB board shape should be as close to square as possible, 2&TImes is recommended; 2, 3, & TImes; 3,… Makeup; But don’t make a Yin and Yang board

2.PCB board width ≤260mm(SIEMENS line) or ≤300mm(FUJI line); If automatic dispensing is required, PCB board width &TImes; The length of 125 mm or less & TImes; 180mm.

3. The outer frame (clamping edge) of PCB board should adopt closed-loop design to ensure that PCB board will not be deformed after it is fixed on the fixture

4. The center distance between the small plates should be controlled between 75mm and 145mm

5. There should be no large device or extended device near the connection point between the outer frame and the inner small plate, and between the small plate and the small plate, and the edge of the components and the PCB board should be left with a space greater than 0.5mm to ensure the normal operation of the cutting tool

6. Four positioning holes are opened at the four corners of the outer frame of the board, with an aperture of 4mm±0.01mm; The strength of the hole should be moderate to ensure that it will not fracture in the process of upper and lower plates; Aperture and position accuracy should be high, hole wall smooth without burr

7. Each small board in PCB board should have at least three positioning holes, 3≤ aperture ≤6mm, edge positioning holes within 1mm are not allowed to wire or patch

8. The reference symbol for PCB whole board positioning and for fine-pitch device positioning should be set in the diagonal position of QFP with a pitch less than 0.65mm in principle; Positioning datum symbols for PCB sub-boards should be used in pairs and arranged on the diagonal of positioning elements.

9. Large components should have positioning posts or positioning holes, such as I/O interface, microphone, battery interface, micro switch, headphone interface, motor, etc.

10. When setting the reference anchor point, an open welding zone larger than 1.5mm is usually set aside around the anchor point