Universal Grid System

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   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.

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rmozel Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 26 Nov 2017 Status: Offline Points: 15	Post Options Post Reply Quote rmozel Report Post Thanks(0) Quote Reply Topic: Universal Grid System 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.



Nick B Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 02 Jan 2012 Status: Offline Points: 1904	Post Options Post Reply Quote Nick B Report Post Thanks(1) Quote Reply 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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Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716	Post Options Post Reply Quote Tom H Report Post Thanks(1) Quote Reply 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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