Pay attention to details during the construction of pc board engineering
1. The screw spacing can be arranged appropriately according to the thickness of the board. It is not good if the spacing is too small or too large. If the spacing is too small, sometimes it will cause stress and damage due to being too tight; if the spacing is too large, the PC board may be unstable. For this reason, the lower spacing is recommended:
a: If fixed with a bead, the spacing is 20~30cm
b: The plate thickness is below 3.0mm, and the spacing is 10~20cm
c: The thickness of the board is below 3.0mm, and the spacing is 20~30cm
2. The screw must not be locked too tightly, otherwise it will deform and induce stress.
3. The size of the screw hole must take into account the difference between the expansion and contraction of the PC sheets in summer and winter and the book night. Generally speaking, the screw hole diameter should be 2~4mm larger than the minimum screw diameter to reserve room for expansion
4. When the screw hole is too close to the edge of the PC sheets, it is very easy to cause the board to break. In other words, the position of the screw hole from the edge of the PC board is more than 2.5 times the diameter of the screw hole. For example, for a screw with a diameter of 4mm, the position of the screw hole should be at least 1cm away from the edge of the PC board.
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