Dennis Saputelli wrote: > they said with a big plane it is harder to etch > > there must be at least a bit of truth to that because i have had this > trouble with this type of board from 3 different shops - albeit not the > highest tech shops kicking around > > the board was pretty long, about 15 inches, that may or may not be a > factor
Boards with large density variations can cause a problem. A single gap in a large plane of copper is usally etched first, and large areas of non-copper will locally deplete the etchant, preventing full etching in that area. Conversely, for plating, where most of the trace definition is done in the SMOBC process, the large areas of copper may deplete the copper bath, and leave the plating thinner there. Anyway, modern process gear is a lot more tolerant of this sort of variation, as the boards we design drive the industry to develop equipment that can handle it without stressing the process to where it becomes unreliable. Jon * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
