Setout ellipse curve with the traditional method of four-center will bring up offset of point and deformation of chart .
四心圆法测设椭圆曲线会造成点
,图形变形。
Setout ellipse curve with the traditional method of four-center will bring up offset of point and deformation of chart .
四心圆法测设椭圆曲线会造成点,图形变形。
In the production process of PCB, there are many defects such as surface smudginess, solder mask unevenness, text excursion, pad damage, track damage etc.
在印刷电路板的生产过程中,会产生外观不整洁、阻
不
匀、文字、线路及盘破损等缺陷。
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