Design-rules
Design recommendations
These recommendations are meant as hints on design appropriate to production process that is also cost efficient. Well thought out design minimises your reject rate as tolerances and production conditions are considered as early as the layout drafting stage.
Annular Rings
The pads of plated holes must be larger than the respective holes belonging to them. Therefore, an annular ring is produced which ensures the metallization
Arrangement of Layers: Test Coupon
With the integration of test coupons during the elaboration of the layout, the correct order of the layers may be verified without any further documentation
Assembly Panel and Production Panel
Printed circuit boards are (often) produced in panels. From the point of view of the CAD design, the production and the assembly, the term "panel" has a
Base material (flexible)
Flexible materials are independently used for single- or doublesided printed circuit boards or as a flexible part in a multilayer.
Base material (rigid)
The base material is the carrier of the assembly. Its technical features may influence the function of the electronic circuit.
Carbon conductive Lacquer
Carbon conductive lacquer is a fine-grained, conductive soot- and graphite-paste applied by screen printing. Carbon conductive lacquer improves the
Component Definition
With the definition of components in the CAD-library, decisive parameters for the CAD design, the post-process and the CAM processing are determined.
Coordinate Systems
Coordinate systems are indispensable for the elaboration of CAD layouts, the transfer of data to the CAM systems and for the production of printed circuit
Cost Calculation
The calculation of printed circuit boards is based on the technical specification of the CAD layout.
D-Code-list
The D-code-list or aperture table describes the graphic tools used in a Gerber file. The D code-list is indispensable for the CAM processing of the CAD data.
Design optimisation
The optimisation of the CAD design increases the ability to produce the printed circuit board, the safety of assembly process and the functional stability of
Drilling plan
The drilling plan is necessary for the production and the quality inspection of the printed circuit board and serves as information for the assembly
Drilling symbols
The drilling symbols represent the position and the diameter of the holes in the drilling plan. The assignment of the drilling symbols to a certain hole is
Drilling tools
The final diameter (=desired diameter) of a hole depends on the galvanic surface-finish of the printed circuit board and on the tool tolerance. The choice
Drills and Holes
The holes on a printed circuit board are classified as: a.) Assembly holes (fixing of the board in a housing, fixing of components on the board, adjusting of
Etching
By means of etching, a continuous copper cladded layer is structured. For generating the conductive pattern, the etching is effected selectively by using
Excellon
The Excellon data contain the information on the coordinates of the holes of a CAD layout. The Excellon format is a standard file structure which ensu
