Electronics > Beginners
Drill pairs for 4 layer PCB
thinkfat:
--- Quote from: ZeroResistance on July 08, 2019, 11:21:18 am ---
--- Quote from: thinkfat on July 08, 2019, 11:02:39 am ---
If you use copper pours for the internal planes (which is what you typically do) you won't be able to do them without a net assigned anyway.
If you use an Altium PCB software, Designer or their free CircuitMaker and want to use JLCPCB as the board house, be advised to set the layer type of the internal layers to "signal". Otherwise the generated Gerbers will not be compatible with their processing.
--- End quote ---
Didn't know that internal planes are generally copper pours, I guess the software does the planes for you, and you don't need to do any pours.
Thanks for the info regarding JLPCB.
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That depends on the software you use. In Altium, if you set the layer as "power plane" you'll just specify a net for the plane and some other parameters and it will do it for you. But this is exactly what you cannot do with JLCPCB, because it will create "negative" Gerber files which they cannot process. So use a "signal" plane and put a copper pour manually.
The only other software I know intimately enough to talk about is KiCAD, and there you will need to manually put a cooper "area" and assign a net to it.
mikeselectricstuff:
There are typically 2 ways - specify the layer as a plane, which produces a negative gerber, or a normal signal layer, onto which you place pours.
The former can be better for single planes as it can reduce screen clutter, the latter is better if you have multiple planes and traces on that layer.
tszaboo:
If you dont know what a blind or a buried via is, or what is backdrilling, than dont do it, cause you dont need it. If you make a PCB with not standard via structures, your price goes up tenfold. You've been warned.
ZeroResistance:
--- Quote from: thinkfat on July 08, 2019, 11:39:27 am ---
That depends on the software you use. In Altium, if you set the layer as "power plane" you'll just specify a net for the plane and some other parameters and it will do it for you. But this is exactly what you cannot do with JLCPCB, because it will create "negative" Gerber files which they cannot process. So use a "signal" plane and put a copper pour manually.
The only other software I know intimately enough to talk about is KiCAD, and there you will need to manually put a cooper "area" and assign a net to it.
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So is this a limitation of JLCPCB processing pipeline? I guess you learnt this from experience? Or did JLPCB inform you that your gerber's were not compatible with their processes?
thinkfat:
--- Quote from: ZeroResistance on July 08, 2019, 12:57:45 pm ---So is this a limitation of JLCPCB processing pipeline? I guess you learnt this from experience? Or did JLPCB inform you that your gerber's were not compatible with their processes?
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Yes, limitation on their side. It's in their FAQ, actually. I advise to have a look at their manufacturing FAQ and capabilities page before you start with the PCB. You'll have to set up the design rules according to their manufacturing capabilities or you might design a board that they cannot produce. Minimum drill size 0.3mm, just one example.
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