PCB fabs and pad/hole overlap

[shadewind]

I'm designing a PCB and am considering using JLCPCB to manfacture it. However, in my current design, I inevitably end up with overlapping pads and holes. Specifically, these cases:

• Plated hole overlaps with plated hole
• Unplated hole overlaps with unplated hole
• Unplated hole overlaps with plated hole

Does anyone have experience with this with JLCPCB or other PCB services for that matter? Any special care that needs to be taken? Special instructions? Things to avoid? Workarounds? Fabs to prefer over others?

Intuitively, case 1 and 2 seems like they should be unproblematic as longs the gerbers are not misinterpreted by the factory. Number 3 seems like it could cause issues since you need to drill through a plated hole, could this cause issues?

[SneakyRobb]

In my experience Jlcpcb is good at telling you exactly what they like, don't like, and if they don't like it how much extra it will cost you. Or they will say please redesign.

You really just need to send an email to support asking them about these 3 options.

Also you say you need overlapping pads and holes. Is this really set in stone? can you post an example of why this arrangement is necessary?

[shadewind]

In my experience Jlcpcb is good at telling you exactly what they like, don't like, and if they don't like it how much extra it will cost you. Or they will say please redesign.

You really just need to send an email to support asking them about these 3 options.

Also you say you need overlapping pads and holes. Is this really set in stone? can you post an example of why this arrangement is necessary?

To be honest, I don't really need anything since I'm mostly doing it for myself. I'm emulating the layout options in the KBD75 and this makes the ISO/enter/backpace area end up like this:
https://www.dropbox.com/s/sobk6rpj5uocryd/padholeoverlap.png?dl=0

As you can see, one of the pads of net ROW3 overlaps with one of the stabilizer holes for the ISO return key. This is just one example.

But thanks for the information about JLCPCB. In the end, if there's any trouble I'm probably just going to ditch multi layout this time around but it's interesting to know how people do it.

[gorbachev]

My experience with ALLPCB is that they will flag it, ask you about it and then you can tell them "it's by design", and they'll happily fabricate it. It will delay the manufacturing by about 2 days, though.