Printed Circuit Design & Fab - February 2009 - (Page 33)

MATERIAL rEGiStration FiGurE 5. The influence of core structure on the average scale factor required for optimal registration. FiGurE 6. The distribution of scale factors for a single core thickness (3 mil) where that core is used in a variety of multilayer builds and constructions. can be applied to the subsequent drilling process. Such compensation factors can be fed automatically to Drill/CAM eliminating errors caused by manual calculations and subjectivity. The system is compatible with the leading optimizer systems and providing that the machines are networked – the system can easily access and process data from multiple machine types. In this way, a facility that has more than one type of post lamination optimizer will benefit from a common graphical user interface to their data. Benefits of an integrated registration control system include a cycle of continuous improvement that can: ■ Predict – Scale factors predicted at CAM ■ Measure – Post lamination optimizer ■ Optimize – Reactive optimization to improve batch yield immediately and feedback scale errors to the Prediction Engine for further-improved prediction accuracy This leads to the key benefits: knowledge and understanding of the material and process factors that influence and control registration. The chart illustrated in FiGurE 5 is based on data accumulated from a number of different PCB facilities and demonstrates the influence of core structure on the average scale factor required for optimal registration. Of course, the optimal scale factor for each given core depends on many other factors. FiGurE 6 shows the distribution of scale factors for a single core thickness (3 mil) where that core is used in a variety of multilayer builds and constructions. rEFErEncES 1. Prof C. Tenopir, University of Tennessee, USA (quoted at www.success.co.il/is/dik.html). nEil chilton is sales and marketing director at XACT PCB Limited and can be reached at neil.Chilton@xactpcb.com. Get your Conclusion The measure of success for a registration prediction and control system is that it should: interface with existing equipment and data streams; close the loop between CAD and process; improve yields; reduce lead time and improve throughput; and, of course, improve profit. A long-term user of this system determined within a few months of use that it no longer required first article lots because the predicted CAM scale factors proved to be right the first time. This enabled new PCB designs to be committed straight to production – significantly reducing lead-time and costs. pCd&f daily dose of PCB industry news and views. Subscribe to PCB UPdate www.pcbupdate.com The daily e-mail newsletter filled with news and resources for PCB design, fab and assembly professionals printEd CirCuit dESign & fAB 33 FEBRUARY 2009 http://www.success.co.il/is/dik.html http://www.success.co.il/is/dik.html http://www.pcbupdate.com

Table of Contents Feed for the Digital Edition of Printed Circuit Design & Fab - February 2009

Printed Circuit Design & Fab - February 2009 Contents Our Line Market Watch Around the World Happenings ROI Tip Jar BGA Bulletin Interconnect Strategies Final Finsh Forum Defects Database Embedded Active Components In Multilayer LCP Packages Simulation: The Need for Speed Advanced Registration Systems The DC Design Squeeze Ad Index Do You Really Want a Better Autorouter? Designing With Conductive Materials, Part 1 Off th eShelf Marketplace On the Forefront

Printed Circuit Design & Fab - February 2009

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