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| Reply To: | TechNet E-Mail Forum. |
| Date: | Tue, 30 Dec 2003 16:31:54 +0200 |
| Content-Type: | text/plain |
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Bruce,
To my opinion you have to look on the purpose of the request and not on the
request itself.The purpose is to assure minimum of annular ring,especially
to have good connection to the conductor.
I would ask some questions:
-what is the minimum annular ring on coupon??
-what is pad diameter and hole diameter in the coupon compared to what
actually exist in the panel itself ? Usually coupons do not represent the
combinations existing in the panel
- does your manufacturer add teardrops??? This makes request for annular
ring of 2 mills less important.
Good luck
> -----Original Message-----
> From: Bruce D Stilmack [SMTP:[log in to unmask]]
> Sent: ג דצמבר 30 2003 16:06
> To: [log in to unmask]
> Subject: [TN] Annular ring
>
> I have a PCB manufacturer requesting a waiver for the MIL SPEC requirement
> of a 2 mil annular ring. Their position is that the coupons are from the
> edge of the laminate where the registration is worse. The assumption is
> that the ring will be larger in the PCB itself. I am leery to grant a
> waiver to allow this deviation, but would like to know how the community
> feels about this.
>
> Bruce Stilmack
> GDLS-TO Manufacturing Engineer
> (850) 574-4773
> [log in to unmask]
>
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