ChildOfVision
Member
Sorry, guys, I went a little off-topic, but these pinholes drives me crazy too...
Anyway, thanks for the suggestions!
I saw it with a metal saw with fine teeth, the blade is under a blunt angle with respect to the PCB (nearly parallel), the cut is very clean and tidy, without damaging the board or copper.evaine23 said:...how do you cut your pcb before etching?
Toner is quickly separated from the copper, just keep floating to the surface in the form of tufts. The rest of toner remains firmly on copper until the end of etching. I do not know whether is the toner under etched first, and then falls off; I am trying to figure out this thing !evaine23 said:Did you say you saw the toner detach from the copper while etching or if the copper being etched out from under the toner and then the toner falls off?
Therein is the great enigma: After laminating, toner withstand severe brushing with toothbrush and dish-detergent, without any damage or separation! Therefore I assume that the laminating is properly done.3v0 said:When the toner does not stay on the PCB most of the time the problem is that the laminator is not getting hot enough.
Yes, my research so far is going in this direction! Problems have occurred when I started to use the brand new FR-2 laminate which seems to be very clear; I assumed that sanding is not necessary, I'm only washed PCB well in detergent and cleaned thoroughly with acetone! Now I'm sanding each PCB, trying new and different kinds of paper, in order to get good and consistent results.3v0 said:You could also try hitting the PCB with 600 grit sandpaper to give the toner a better surface to stick to.
Yes, I try this also...3v0 said:Using a hatched pattern for a pour (eagle has this) can help.
I allready have white TRF which I use for silkscreen (with "gummed paper"), but I do not know whether green TRF works with toner which has paper residues on the surface or toner must be pure without paper residues???3v0 said:You can get a green foil from pulsarProFx.com that is laminated to the top of the toner to seal pin holes.
I always wear clean gloves after cleaning with acetone !3v0 said:keep you fingers off the PCB surface after cleaning to prevent transfer of body oils
Anyway, thanks for the suggestions!
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