Re: [PEDA] Polygon Track Spacing
>>More likely, they're suffering from islands of resist detaching and floating around, causing 5 thou gaps wherever they land. I've certainly been asked to avoid similar features (although normally it's tracks leaving pads and looping round the side of the pad, << Good point. I once had trouble with solder mask over solder plated tracks with large copper areas. When it went through wave solder the solder mask would delaminate on the melted solder and end up "scooping" up globs of solder. I solved this with cross hatch copper areas instead of solid copper areas. This problem goes away with SMOBC, which is my preference. But as track density went up and feature size went down, I started making my cross hatch pattern very fine, not realizing I could be causing a fab problem. I guess I will just go back to solid copper, not much reason for the cross hatch any more. Thanks for all the quick yet thoughtful responses. Lloyd * Tracking #: 8BE5C309EF15E547B247461A556B0D081A4951B8 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Polygon Track Spacing
> I just had a board vendor reject my gerbers due to the track spacing > within a polygon pour. I have been using 15 mil tracks on a 20 mil > grid and this yields 5 mil track spacing, which violates the 8 mil > track spacing minimum this board vendor has. > > Since all these tracks are shorted together anyway, does it make any > sense that this could be a problem with making a board? OK. It's in a polygon so the implications aren't so important, but surely this is a good thing. Don't you want a vendor that comes back to you on out-of-spec issues ? Do you want a bucket chemist to second guess your design ? If you don't mind them shorted, why didn't you make it solid ? Should you specify which rules to ignore ? Does the DRC only apply to the tracks that pass ? > I have never heard of this before. (30 years experience) Doesn't that concern you ? For 30 years your vendors have accepted board designs that they know are outside of their manufacturing capabilities ? They probably all have ISO9000 too. > Anyone else in the group heard of this? Functional Quality Control ? It's a marketing term isn't it ? :-) Steve. == Steve BaldwinElectronic Product Design TLA Microsystems Ltd Microcontroller Specialists PO Box 15-680, New Lynn http://www.tla.co.nz Auckland, New Zealandph +64 9 820-2221 email: [EMAIL PROTECTED] fax +64 9 820-1929 == * Tracking #: E02DFA20734BA04C984473790C68C0C683079030 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Polygon Track Spacing
29/08/2002 22:18:44, "Dennis Saputelli" <[EMAIL PROTECTED]> wrote: >they probably just went ISO or something :o) More likely, they're suffering from islands of resist detaching and floating around, causing 5 thou gaps wherever they land. I've certainly been asked to avoid similar features (although normally it's tracks leaving pads and looping round the side of the pad, with a few thou clearance - Specctra quite likes this tactic. Protel DRC regards these as not a problem, since they're same net, but it's a too-fine feature on the copper, and the thin section of resist, tethered only at one end, has a tendency to swing around and cut the track. Bare- board testing picks it up, but it causes rework or rejects. A rule that could spot this would be extremely handy...) Steve * Tracking #: 65DE11A4E1492F46A78D49F004B8B46E87A759C7 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Polygon Track Spacing
they probably just went ISO or something :) no seriously though i could see this as at least a potential cosmetic issue for the fab (not being able to hold the dimensions) that could be enough to trigger a reject from the customer ... why use these dimensions anyway? you don't want a solid due to warpage or soldering or something? if you do want a cross hatch i would think the open parts should be bigger Dennis Saputelli Lloyd Johnson wrote: > > I just had a board vendor reject my gerbers due to the track spacing within > a polygon pour. I have been using 15 mil tracks on a 20 mil grid and this > yields 5 mil track spacing, which violates the 8 mil track spacing minimum > this board vendor has. > > Since all these tracks are shorted together anyway, does it make any sense > that this could be a problem with making a board? > > I have never heard of this before. (30 years experience) > > This vendor also made earlier revisions of this same board twice before with > no problem. These earlier boards had the same polygon track spacing. > > Anyone else in the group heard of this? > > Lloyd Johnson > DSS, San Marcos Calif. > * Tracking #: 7DD559E92358C1419D337F88AB761957FAD13634 * -- ___ www.integratedcontrolsinc.comIntegrated Controls, Inc. tel: 415-647-04802851 21st Street fax: 415-647-3003San Francisco, CA 94110 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Polygon Track Spacing
I have not heard of that being a problem , but you could point out to them the fact they have made this board twice now and why do that consider it an issue this time? > -Original Message- > From: Lloyd Johnson [mailto:[EMAIL PROTECTED]] > Sent: Thursday, August 29, 2002 1:37 PM > To: Protel EDA Forum > Subject: [PEDA] Polygon Track Spacing > > > I just had a board vendor reject my gerbers due to the track > spacing within a polygon pour. I have been using 15 mil > tracks on a 20 mil grid and this yields 5 mil track spacing, > which violates the 8 mil track spacing minimum this board vendor has. > > Since all these tracks are shorted together anyway, does it > make any sense that this could be a problem with making a board? > > I have never heard of this before. (30 years experience) > > This vendor also made earlier revisions of this same board > twice before with no problem. These earlier boards had the > same polygon track spacing. > > Anyone else in the group heard of this? > > Lloyd Johnson > DSS, San Marcos Calif. > > > > > > ** > ** > * Tracking #: 6362BACF8ECFE04DAA6DAC25BC0C038F6CC37553 > * > ** > ** > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Polygon Track Spacing
[PEDA] Polygon Track Spacing
I just had a board vendor reject my gerbers due to the track spacing within a polygon pour. I have been using 15 mil tracks on a 20 mil grid and this yields 5 mil track spacing, which violates the 8 mil track spacing minimum this board vendor has. Since all these tracks are shorted together anyway, does it make any sense that this could be a problem with making a board? I have never heard of this before. (30 years experience) This vendor also made earlier revisions of this same board twice before with no problem. These earlier boards had the same polygon track spacing. Anyone else in the group heard of this? Lloyd Johnson DSS, San Marcos Calif. * Tracking #: 6362BACF8ECFE04DAA6DAC25BC0C038F6CC37553 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
