"1oz copper| 0.2mm FR4| 0.5oz copper| 1.2mm FR4| 0.5oz copper| 0.2mm FR4| 1oz copper" is this correct ?
When exporting 4 layer gerbers, altium exports the inner 2 layers as "negative" (filled in areas are actually the ones that should be etched out), does the board house support that ? I haven't found ANY gerber tool that would let me invert a layer.
Or does it depend on the extension supplied ? In that case, .G1 and .G2 for non-inverted, and .GP1 and .GP2 for inverted ?
you can change that with a text editor by changing the film polarity. Look for a line with %IPPOS*% near the top of the gerber file and change it to %IPNEG*%, or from IPNEG to IPPOS.
I was hoping for someone to just tell me what setup they used when submitting a 4 layer order to dirty, and how it came out (since it is a different board house, maybe they have better tolerances too ?). Even the eagle CAM file is only setup for 2 layer. Dont want to name my inner layers wrong and then find out that they inverted them for me (if i already inverted them) or vice versa.
The factory engineers at the four layer board house are really good about catching things like that. .GP is the internal plane layer and is inverted to the best of my understanding.