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, approaching mass lamination size, are uncommon but available in very high-volume or backplane fabrication specialty facilities 274413 Custom-Cut Panels Asian fabricators have pioneered flexible custom-cut panel sizes to maximize material utilization further and so reduce costs The difference between standard and flexible cut panels is that standard-cut panels have a limited number of predetermined sizes and consequent hard-tooling configurations, while the flexible cut panels afford a continuous range of size because the tooling isn t fixed but highly configurable Flexible cut panels are often paired with riveting instead of pinning to hold the details, prepreg, and foil together for lamination Many Asian facilities will offer both approaches, selecting the best suited to the job at hand 27442 Front-End Tooling The first aspect of the ML-PWB tooling is commonly called front-end tooling or simply computer-automated manufacturing (CAM) tooling.

(See IPC2514A, GenCAM [BDFAB], Sectional Requirements for Implementation of Printed Board Fabrication Data Description IPC-2514 is a standard developed by the Computerized Data Format Standardization Subcommittee [2-11] of the Data Generation and Transfer Committee [2-10] of the Institute for Interconnecting and Packaging Electronic Circuits The GenCAM format is intended to provide CAD-to-CAM, or CAM-to-CAM, data transfer rules and parameters related to manufacturing printed boards and printed board assemblies IPC2514 is a section requirement within IPC-2511B, Generic Requirements for Implementation of Product Manufacturing Description Data and Transfer XML Schema Methodology ) The front end is where manufacturing personnel using a CAM software package generate all phototools, the associated computer numerical control (CNC) electronic files (used by equipment such as drillers and routers), the construction stack-up, and the part manufacturing instructions, or work order, also called the traveler.

The CAM station mirrors the tooling method chosen for the shop and the job s work order The CAM software overlays the tooling pattern on each circuit layer to produce the master pattern alignment The master artwork pattern is then photo-plotted to reproduce the artwork film tools for the imaging operations Several important manufacturing functions fall within the bounds of the front-end tooling responsibility 274421 Design Rule Check (DRC) Design rule check (DRC) is where the electronic design data are analyzed against a specific set of fabrication rules, a virtual design for manufacturing (DFM) The capabilities and attributes of these rules are based on sound, industryproven values that match the technology targeted for construction The default values embedded into the CAM are input by the manufacturer as technology files.

These files should reflect the capability of the fabricator s equipment and processes in light of how they are utilized against the ML-PWB type being produced..

274422 Panelization To gain economies in the manufacturing process, the individual board design is stepped and repeated within the artwork tooling Panelization is the term used to describe this method Here the elemental goal is to yield as many parts on one process panel as possibleThe CAM software allows manipulation of the single design pattern to place or nest multiples within the confines of the chosen panel dimensions 274423 Artwork Generation (Photo-Plotting) Once the design has been formatted into the desired panelization, it is ready to be made into a working phototool The CAM data are output to a server that converts the data into a language recognizable by the plotting equipment The plotter exposes the circuit pattern on the film tool.

we read off the following curvature one-forms:

Typically, the film tool is polyester-based with a silver emulsion and is exposed by means of a laser or fiber-optic light source The resolution of the light source directly affects the ability to image the technology type Note that when the technology type approaches the feature size of HDI, the use of an alternative approach to phototooling may be employed This is known as laser direct imaging, and, as the name implies, the image is directly exposed onto the production innerlayer, thereby eliminating the use of a phototool 274424 CNC Drilling Routing Tools The machine communication method commonly employed in the automation of the drilling and routing process is output from the CAM tooling as CNC programs (from the earliest computer numerical control machines, as differentiated from manual or template positioning systems) The front-end tooling software facilitates the organization and optimization of the CNC routine.

The routine must match the flow of the technology process steps being produced When sequential processing is required, the drilling routing data must be broken out into separate routines When the technology type involves HDI features that require laser drilling, specific tooling accommodations have to be considered to match the discipline of the laser equipment for example, the use of special imaged fiducial targets or a special dot mask aligned to the drill locations 274425 Automatic Optical Inspection (AOI) Another aspect of the tooling set is the data configuration to support the automated optical inspection (AOI) process AOI is considered part of the detailed inspection process.