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Universal Grid System

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=2404
Printed Date: 07 Oct 2024 at 3:23am


Topic: Universal Grid System
Posted By: rmozel
Subject: Universal Grid System
Date Posted: 17 Nov 2018 at 10:53am
A few years ago, I read Mr. Hausherr’s article about PCB design grid systems and found it very effective and beneficial. I am aware of the article itself is quite dated and these days 10um grid is more prevalent but 50um grid still proves useful for two thirds of my current designs.

I’m using 50um grid system down to 0402 (imp.) chip component sizes without issues but creating symmetrical and evenly dividable patterns for proper placement (including courtyard) requires a good deal of manual effort. When I use LE Pro (free edition) for this tasks, I sometimes find generated components are not suitable for the grid system even I forced some settings, i.e., pad and placement roundoff errors to +-0.05mm.

My question is about the creation of parts with LE that is “compliant” or usable with a 50um grid system. Is there a set of parameter settings definition that adjusts appropriate fields accordingly?

Regards.


Replies:
Posted By: Nick B
Date Posted: 17 Nov 2018 at 12:06pm
The FPX file library contain just the package dimensions, other settings for pad width length, width, shape and spacing are set in Preferences, which are all user-definable.

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Posted By: Tom H
Date Posted: 19 Nov 2018 at 10:37am
The round-off values for pad size and spacing are located in "Preferences > Terminals > Settings".

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