Shortest answer:
poll your offshore volume fab contacts for this design limit. I would -- even if I had the answer in my design rules/constraints folder. It's an obscure enough detail I wouldn't be confident w/out reconfirming it. If you don't have direct offshore fab contacts for this type board feel free to contact me off forum and I'll get you good contacts.
Longer answer/speculation:
If it is an otherwise simple board profile with no tight tolerance features in the router profile then the low cost high volume fab will want to maximize stack height on the router table. 2 or 3 high commonly in volume. If I understand it correctly, the higher stack height dictates the minimum drill diameter. For a given diameter there is some max flute length available and that has to get through the entry material, the board/panels stacked and into the backup material. All those inputs can vary by fab.
-----Original Message-----
From: Frank Kimmey [mailto:[log in to unmask]]
Sent: Tuesday, May 1, 2018 6:25 PM
To: Dwight Mattix <[log in to unmask]>
Cc: TechNet E-Mail Forum <[log in to unmask]>
Subject: Re: [EXT] RE: Small slots
A little more data,
062 thick
High volume
Off shore
Price gets offset by performance needs
I am looking for what others might be doing without premium My current fabs will say can do but then will eek the price up to compensate.
I have asked them also, I was jut wondering what everyone else was doing Thanks FNK
Sent from my iPad
> On May 1, 2018, at 6:11 PM, Dwight Mattix <[log in to unmask]> wrote:
>
> <Engineering canned response #1>
> "It depends."
>
> How thick your board?
> What volumes you running? NPI_QTA onshore? Production offshore?
> Commodity like super price sensitive pwb fab or high end *BUTS fab?
>
> dw
>
> *
> Big
> Ugly
> Thick
> Suckers
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Frank Kimmey
> Sent: Tuesday, May 1, 2018 2:55 PM
> To: [log in to unmask]
> Subject: [TN] Small slots
>
> How narrow a plated slot can be done without premium?
> I realize this is very objective but my bosses want some number.
> They won't be satisfied with what my vendor says unless I can back it
> up I'm thinking 0.5 mm but would like to know what others think Any
> help is appreciated, FNK
>
> Frank N Kimmey CID+
> Electrical Engineer/PCB Design
>
> Verifone
> 1400 W Stanford Ranch Road
> Rocklin, CA 95765
> T: 916-625-1818
> M: 916-833-9877
>
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