> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Karel Kulhavy > Sent: 30 August 2005 10:10 > To: [email protected] > Subject: Re: gEDA-user: PCB: mesh style plane? > > On Mon, Aug 29, 2005 at 02:09:31PM -0400, 9000 VAX wrote: > > Hi, list, > > I found that my two-sided board curved a little bit > toward the side > > with more copper plane area, maybe due to the tension in the copper > > plane. I think mesh style plane other than solid plane > might solve the > > problem. Does PCB support this feature? Thank you. > > Then it's probably something wrong with your process. I make > boards like this and the company (Pragoboard, Prague, Czech > Republic) always delivers them perfectly flat.
FR4 boards do this if you have a big board with a great amount more copper on one side than the other. Putting copper mesh on the other side is a common method of avoiding it. Sometimes you can live with a little warping, sometimes you can't. The amount of warping you get depends on the thickness of the copper layer and the FR4. I think sometimes heating it can make it worse.
