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PCB Copper thickness of FR4 material ?
836
1
Aug 13.2019, 18:13:38
If buying a stack of blank double sided 1.5mm PCBs, without knowing specifically what they will be used for, would you buy 35u (1oz) or 70u (2oz) boards? I understand that thicker layers are needed for high currents (duh), but other than cost is there any drawback to using 70u boards? I will be "isolation milling" them, if that makes any difference.
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A****min
Aug 21.2019, 09:34:13
If you want to mill boards then they will need to be extremely flat. FR4 will wear down your milling bits quickly. Also the copper and epoxy dust from the milling isn't healthy. I strongly advise to etch boards. It will be quicker and cost less to setup. Ferric Chloride (FeCl) etchant can be (re)used indefinitely by adding HCl when it slows down.
