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Question About Pad Place Round-off

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=2174
Printed Date: 07 Oct 2024 at 1:23pm


Topic: Question About Pad Place Round-off
Posted By: nicolasr
Subject: Question About Pad Place Round-off
Date Posted: 21 Jun 2017 at 1:56am
Dear all,
There is something I definitely do not understand with PCB Library E. Lite.  I use the 2017.14 release.

When generating a Chip capacitor 0603 for instance, In Terminal/Settings I have 0.01 set for both Pad Place Round-Off and Pad Size Round-Off.
Generated pads are 0.93x0.82mm which are fine.
But X position is ±0.755 meaning a 0.005 increment instead of being rounded to 0.76 or 0.75?!

Is it a bug or some other setting having higher priority??
Thanks,


Replies:
Posted By: Tom H
Date Posted: 21 Jun 2017 at 8:32am
I believe the pad place round-off is the spacing between the pads.

For example on an 0603 capacitor the space between pin 1 & 2 are rounded to 0.01 increments. Not the distance from the origin to the pin.

Try using a 0.02 pad place round-off and you'll get 0.01 rounding from the origin to the pin.




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Posted By: nicolasr
Date Posted: 22 Jun 2017 at 6:37am
Oh, didn't see it this way... shame on me! Sometimes the simpler the better.
Thanks!

Posted By: nicolasr
Date Posted: 23 Jun 2017 at 1:48am
Additional question, what how would you do to round off to 0.01 when it is given as pitch (for instance, SOT23 or SOD...)
A pitch of 0.65 gives pads placement at 0.325... despite pad placement round off at 0.02!

Posted By: Tom H
Date Posted: 23 Jun 2017 at 7:36am
Pad place round-off is only in 1 direction, the Lead Span pads.

The pitch is always the pitch and there is absolutely no rounding on the pin pitch. The pitch has to be 100% accurate.


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