PCB routing/milling
- Thread starter gyraf
- Start date
Help Support GroupDIY Audio Forum:
Actually (at least this was my impression from Gustav's plant), they drill and through-plate holes first, then apply silkscreen resist and etch tracks. Something about the electrochemical stuff working better with large copper areas.
On multilayer, "inside" tracks are etched first and laminated together, leaving outer surfaces as bare copper - then drilled, throughplated, and finally outer layer etched.
Jakob E.
On multilayer, "inside" tracks are etched first and laminated together, leaving outer surfaces as bare copper - then drilled, throughplated, and finally outer layer etched.
Jakob E.
gemini86
Well-known member
So what kind of material are they using to protect the holes during etching?
the silk screen ink that's poured on for protecting the tracks anyway
gemini86
Well-known member
So they trim the silkscreen after etching?
trim?
gemini86
Well-known member
Sorry, just watched a few videos and it seems they the apply a protecting coating through the holes and over all the traces before etching, which is removed after etching, but before the actual soldermask is applied, since the soldermask also covers much of the board, but leaves the pads and holes exposed.
