The Gerber Guide, Chapter 2


Reading time ( words)

It is clearly possible to fabricate PCBs from the fabrication data sets currently being used; it's being done innumerable times every day all over the globe. But is it being done in an efficient, reliable, automated and standardized manner? At this moment in time, the honest answer is no, because there is plenty of room for improvement in the way in which PCB fabrication data is currently transferred from design to fabrication.

This is not about the Gerber format, which is used for more than 90% of the world's PCB production. There are very rarely problems with Gerber files themselves; they allow images to be transferred without a hitch. In fact the Gerber format is part of the solution, given that it is the most reliable option in this field. The problems actually lie in which images are transferred, how the format is used and, more often, in how it is not used.

In this monthly series, I will explain in detail how to use the newly revised Gerber data format to communicate with your fabrication partners clearly and simply, using an unequivocal yet versatile language that enables you and them to get the very best out of your design data. Each month we’ll look at a different aspect of the design to fabrication data transfer process.

This column has been excerpted from the Guide to PCB Fabrication Data: Design to Fabrication Data Transfer.

Chapter 2: Alignment (Registration)

Never mirror or flip layers! All layers must be viewed from the top of the PCB, which means that the text must be readable on the top layer and mirrored on the bottom layer. Alas, sometimes, in a mistaken attempt to be helpful, designers flip layers because they must anyway be mirrored on the photoplotter. This could be helpful in a world where the designer's files are used directly in fabrication, but these data layers are actually input for the CAM system. This needs the correct 2.5D PC structure, so designers need to follow the standard protocol for providing digital data. The fabricator's CAM system will do the rest: it will optimise and panelise the PCB and on output of the final, panelised data, it will mirror, rotate, shift and scale as required by production. Any designer that mirrors layers can only hope that the CAM engineer notices this and ‘unmirrors’ them. 

To read this entire article, which appeared in the September 2015 issue of The PCB Design Magazine, click here.

Share

Print


Suggested Items

Words of Advice: The OEM Systems Designer

11/07/2019 | Andy Shaughnessy, Design007 Magazine
In a recent survey, we asked the following question: What advice would you give an OEM systems designer? Here are a few of the answers, edited slightly for clarity.

Dugan Karnazes Discusses His New Startup

11/07/2019 | Andy Shaughnessy, Design007 Magazine
I caught up with Dugan Karnazes again this year and discussed his new startup, Velocity Research, which is a one-stop shop for design made up of technical creatives. The Grand Rapids company is already doing design work for a variety of customers, from individuals to multinational companies.

Design For Excellence: Karen McConnell on Standards

10/31/2019 | Andy Shaughnessy, Design007 Magazine
During the IPC Summer Meetings, I spoke with Karen McConnell, senior staff CAD CAM engineer with Northrop Grumman Mission Systems. Karen is a veteran PCB designer as well as an IPC committee chair and mentor. She offered an update on some of the IPC committees she chairs, the need for more mentor programs in this industry, and why you can call something a ham sandwich if you define it correctly in the standard.



Copyright © 2019 I-Connect007. All rights reserved.