Ian, both your and Max's comments sound reasonable, I'll endeavour to help out my board house next time. I had thought about this problem before (particularly with regards to 'undercut' over etching on one side), but as I'd never heard any complaints I assumed all was ok.
Tom. > -----Original Message----- > From: Ian Wilson [mailto:i.wilson@;considered.com.au] > Sent: Wednesday, 9 October 2002 10:56 > To: Protel EDA Forum > Subject: Re: [PEDA] OT - Complex boards and time to Layout? > > > On 10:19 AM 9/10/2002 +1100, Thomas said: > >Sometimes that's just not possible though. > >I've recently finished a double sided PCB with allot of > controlled impedance > >tracks on one side widely spaced to prevent xtalk and to > prevent arcing (its > >a surge protection device) with a solid ground plane on the > other side. > > > >My board house has not complained (yet). > > > >Tom. > > Even on such a board there are often things that can be done > to help even > copper distribution. In areas widely spaced from the active > tracks you can > place copper balancing squares or even a hatched polygon. > > When I fully specify a production panel (break offs, tooling > strips etc) I > will usually say the that the production tooling is > uncontrolled space and > the board house is free to add copper balancing features. > Some will, some > won't. Those that do usually add squares along the tooling strip. > > I have not had a board house complain for years about > unbalanced copper > density, but I have had some thank me for making an effort to > balance the > copper. > > Ian Wilson > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:proteledaforum@;techservinc.com * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:ForumAdministrator@;TechServInc.com * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@;techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
