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6 layer board with via, how to specify NC drill file

doginwater

Hello, 

Working on a 6 layer board, the stack-up is:

1. Signal_top

2. Gnd

3. V+

4. V-

5. Gnd

6. Signal_bot

There are 2 vias connecting Signal_top to V+ (call it Via+), and another 2 via connecting Signal_top to V- (call it Via-). Th artwork looks to be correct, but I am wondering if I need to generate NC Drill files by "layer pair" or "by layer".

From what I understand:

     "layer pair" would generate one drill file for all 6 layers.

     "by layer" would generate five drill files, 1-2 2-3 3-4 4-5 5-6.

If drilled by "layer pair", the whole board is press together, drilled, and then plated. I am worried that the plating may not actually connect to the V+ and V- planes. The alternative would be to drill layers 1-2, 3,-4, 5-6, plate each layer, press together, then plate the whole thing again. 

which process sounds more reasonable to you guys? I am not an expert in PCB manufacturing.

Thanks for the advice.

  • redwire
    Try "by layer" -- I suspect from your description you will only get 3 files: 1-6, 1-3, 4-6. If you only have 2 vias that need to connect like this, this is going to be a very expensive PCB to fabricate.
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