pcb钻孔工艺常见问题及处理（Common problems and treatment of PCB drilling process）.doc

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pcb钻孔工艺常见问题及处理（Common problems and treatment of PCB drilling process）.doc

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pcb钻孔工艺常见问题及处理（Common problems and treatment of PCB drilling process）

pcb钻孔工艺常见问题及处理（Common problems and treatment of PCB drilling process） Basic introduction of PCB drilling Source: pcbdown.cn author: admin release time: 2007-11-16 1. Introduction to Drill File Common boreholes and meanings: PTH - plated hole: a hole in the hole wall with a metal used to connect the conductive pattern in the middle or outer layer. NPTH - non - plated hole: the hole wall is not coated with metal and used for mechanical installation or mechanical fixed assembly holes. VIA - guide hole: used for electrical connections between different layers of the printing plate (such as buried hole, blind hole, etc.), But it cannot be inserted into the plated hole of the leg or other reinforced materials. Blind hole: only a surface guide hole that extends to the board. Hole: the guide hole not extended to the surface of the printed plate. Common formats: Sm Exel. DRL System of units: The METRIC (mm) ENGLISH (inch or mil) Unit conversion: 1 inch = 1000 mil = 2.54 cm = 25.4 mm 1 mm = 0.03937 inch = 39.37 mil Coordinate format: LEADING ZERO SUPPRESS: 0 omitted in the front of the coordinate integer, the number of decimal words is not equal to 0. TRAILING ZERO SUPPRESS: 0 ellipsis after the small number of coordinates, the number of integers is not equal to 0. NONE ZERO SUPPRESS: integer and decimal Numbers are not equal to 0. FORMAT (hidden decimal point) : there are ten formats. 2. Introduction of DRILL RACK (DRILL RACK) It mainly describes the size of the drill used in drilling gear, and some also indicate that the hole is PTH or NPTH. The boring disk usually begins with an M48 and is arranged in front of the drilling document. There are also individual documentation. DRILL RACK + DRILL FILE = complete drilling graphics Common fields: Tool: bit number Size: aperture Size Pltd: PTH or NPTH instructions Feed: down speed Speed: Speed Qty: hole number Introduction of Apeture File The lens File mainly describes the shape and size of the lens used for Gerber File. Apeture F