Folks,
in my experience, removing unused pads is definitely something that requires
customer's approval - there's just no question about it.
sometimes, though the removal of unused pads is not only recommended but
necessary: for example when (after etch factor) your spacing is less than 2
mils. When the density of the PCB goes up, there may not be much of a
choice but to convince the customer to let you remove any non-functional
copper lands.
other than in cases like that, unused pads do not present a problem for the
board manufacturer and since they are part of the board's artwork, they
simply can not be removed without the approval of the owner of that artwork.
A. Vigano
-------------------------------------------------------
adeodato vigano
production manager - pcb division
compunetics, inc.
700 seco road
monroeville, pa 15146
phone 412-858-6115
fax 412-373-8060
[log in to unmask]
-------------------------------------------------------
----- Original Message -----
From: Les Connally <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, February 22, 1999 5:19 PM
Subject: Re: [TN] removing unused inner pads ?
>Hi Steve et. al.
>
> We have used Non-functional pads on a large preponderance of our
boards
>for many years now. We have proven that there is a greater reliability of
the
>Plated Through Holes during thermal cycling. This is due to the larger
>percentage of copper in the stack, which reduces the overall Z axis
expansion
>(less polymer in the barrel area). A few of our customers ask for no
>non-functional pads and we comply, but the reliability is lowered.
>
>Regards,
>Les Connally
>
>> From: "Stephen R. Gregory" <[log in to unmask]>, on 2/22/99 3:02 PM:
>> In a message dated 2/22/99 11:12:04 AM Pacific Standard Time,
>> [log in to unmask] writes:
>>
>> << All,
>>
>> Do a lot of board fabricators remove unused pads ?
>>
>>
>> Regards,
>>
>> Jerry Schwartz, CID
>> IPC Certified Interconnect Designer
>> "May the Schwartz be with you" >>
>>
>> Obie-Wan Kanobi...(grin),
>>
>> If I may I inquire, what is it that you mean by unused pads? Pads
that
>> do
>> not have traces to them? I should hope not! Not without at least talking
to
>> the customer, how do they know what's used or not? I've never heard of
>> something like that happening...
>>
>> Sounds like Darth Vader has been a little too sloppy with his light
>> saber
>> around there...hehehe
>>
>> -Steve Gregory-
>>
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