Re: [PEDA] Gerber accuracy
Thanks Steve, That solved the problem. I checked the gerbers and, sure enough, the arcs were converted to straight lines that then violated the clearance settings. Amazing. Cheers, Tom Steve Wiseman wrote: 17/01/2004 00:37:59, Tom Reineking [EMAIL PROTECTED] wrote: I'm sure that I'm missing some basic understanding concerning gerber accuracy. Any clues? Thank you for any suggestions. Yep - use 'track', not 'arc' to generate the teardrops. For some reason, the arcs get turned back into straight lines, and you get the clearance violations you've noticed... thousands of them. Hope that helps, Steve * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gerber accuracy
17/01/2004 00:37:59, Tom Reineking [EMAIL PROTECTED] wrote: I'm sure that I'm missing some basic understanding concerning gerber accuracy. Any clues? Thank you for any suggestions. Yep - use 'track', not 'arc' to generate the teardrops. For some reason, the arcs get turned back into straight lines, and you get the clearance violations you've noticed... thousands of them. Hope that helps, Steve * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
[PEDA] Gerber accuracy
Hi all, I just finished a PCB that used 4 mil tracks and 4 mil spacing imposed by the BGAs. I used teardrops for all pads and the 4 mil clearance was maintained. Using freeDFM checker at Advanced Circuits, I found many clearance errors, especially associated with teardrops. There were also a few pad to pad problems similar to the others. I found the error locations in 99SE PCB but the clearances were correct. I then checked Camtastic and found that there were clearance issues as reported. Typically the error was between 0.5 mil and .002 mil. I know that doesn't sound like much but 0.5 mil is significant down at 4 mil. Round off errors should be much smaller I'm guessing. I tried 2:4 and 2:5 gerber formats, same results. I'm sure that I'm missing some basic understanding concerning gerber accuracy. Any clues? Thank you for any suggestions. Cheers, Tom * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
