These haven't got any reasonable unbalance between the sides. Honestly, it's literally a dozen different boards, all different sizes and fill types, which come in warped. -forrest On Wed, Aug 29, 2012 at 6:43 AM, M.L. wrote: > On Tue, Aug 28, 2012 at 11:24 PM, Forrest Christian > wrote: > > I'm still trying to work with them to figure out if they can either fix > the > > problem with their supplier, or if I can do something to specify slight= ly > > better quality. Honestly, it looks like they are now using a supplier > > which is using 'scrap' FR4 as their base (this is 100% speculation - bu= t > > would account for almost everything I'm seeing). I'm not that picky, > but > > I do need boards which are actually 0.063 thick and are flat, as oppose= d > to > > seemingly random thicknesses 'around' 0.063 and quite warped. > > Forrest, > Do you have a somewhat equivalent amount of copper coverage on either > side of the board? > I have made boards before with a flood fill on one side and a few > traces on the other. They can easily be quite warped if they are of > reasonable dimensions. > > -- > Martin K. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .