Joking apart, I have always wondered where you Americans buy your pcb drills
from, as we are only offered metric sizes eg. 0.30mm = 11.8 thou (correct
term for English speakers for thousandths of an inch) , so when your
drawings call up a 13mil drill we have to use a 0.35mm = 0.01378" drill
which gives us less land to play with.......
regards
Dougal
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE)
Sent: 23 February 2009 14:39
To: [log in to unmask]
Subject: Re: [TN] [TC] [IPC-600-6012] Microvias
So you're saying it was a "run of the mil" definition.
Dewey
-----Original Message-----
From: TestCoupons [mailto:[log in to unmask]] On Behalf Of Lionel
Fullwood
Sent: Tuesday, February 17, 2009 12:27 AM
To: [log in to unmask]
Subject: Re: [TC] [IPC-600-6012] Microvias
Hi Gary:
This is one of the most confusing conventions. In the USA, 'mil' is
0.001". Internationally it is different. I would guess Chris is saying
the USA definition. We need this one carefully defined so there is no
further confusion.
Lionel.
Gary Ferrari
<GaryFerrari@FTG To:
[log in to unmask]
CORP.COM> cc:
Sent by: bcc:
TestCoupons Subject: Re: [TC]
[IPC-600-6012] Microvias
<TestCoupons@ipc
.org>
02/16/2009 10:38
PM
Please respond
to GaryFerrari
Chris,
Is "mil" a "mm" or "0.001inch"? The international definition of a "mil"
is "mm".
Gary
Chris Mahanna wrote:
> Mike et al,
>
> Here is a second completed action from our meeting last week. A
proposed
definition for 2221, 6012 and T-50I:
> ----------------------------
> D+ (D-plus): The difference in diameter between a drilled, or
otherwise
formed hole, and its associated circular land. The unit of measure used
with this term is almost exclusively a mil. For example, a 13 mil drill
into a 25 mil land would be described as a "D+12".
> ----------------------------
>
>
> Thanks,
> Chris
>
>
> Chris Mahanna
> Robisan Laboratory Inc.
> 6502 E 21st Street
> Indianapolis, Indiana 46219
> 317.353.6249
>
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