Gary

Unfortunately this may not completely specify your board. In areas where
there is not a specification, the PCB shop will normally follow their
standard practices which can vary from shop to shop and cause
discrepancies.

I have seen this occur working with other OEMs and if the customer is
using multiple sources which is the right direction, the only
satisfactory remedy I have found is to document the appropriate
requirements.

Best regards

Lee

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, January 12, 2005 1:15 PM
To: TechNet E-Mail Forum; Lee Parker
Subject: Re: [TN]

Lee,

The electrical design engineer specified the copper weight and stack-up
and
asked that the boards be electrically tested for shorts.  No other
requirements
are listed on the drawing.

Gary Bremer
Senior Manufacturing Engineer

Quoting Lee Parker <[log in to unmask]>:

> Gary
>
> I am sure you have additional specifications on your board other than
> " material .062 thick FR4 green
> copperclad laminate for their bare board." Such as perhaps the IPC end
> point specification.
>
> If this is a high speed board you may need to specify the impedance,
the
> dielectric coefficient and the loss tangent of the material. You may
> also want to specify the copper weight if the board is transporting
> large amperages. These are of course, only a few of the many variables
> the designer most control depending upon the intent of the board. Once
> these requirements are understood, the supplier can build a
satisfactory
> board if it is within their capability The specifications are,
however,
> the responsibility of the customer.
>
> My experience has been the variation of board properties is not so
much
> a function of geography, but how well the board has been specified by
> the designer and how well the customer monitors the supplier to insure
> compliance with the spec and drawing.
>
> Best regards
>
> Lee
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Gary Bremer
> Sent: Wednesday, January 12, 2005 10:18 AM
> To: [log in to unmask]
> Subject: [TN]
>
> Hello Designer Council members
>
> At the company I am working for is calling out matterial .062 thick
FR4
> green
> copperclad laminate for their bare board.
>
> My question for the form:
>
> When this design was done in the Northeast by the electrical engineer
> and
> outsourced to a board assembly house as a turnkey component.  What
type
> of
> quality problems can I expect to deal with durning final assembly and
> final
> test?  What long term (customer returns) problems may result from
this?
> Do the
> board fabracation houses on the east coast march to a different
drummer
> than
> the rest of the country?  The electrical engineer does not want to
> change the
> drawing to specify what laminate matterial he truly intends to use.
The
> last
> company I worked for also had this same type of problem.  The
electrical
> engineer designs/releases and I have to fix his mistakes.
>
> Gary Bremer
> Senior Manufacturing Engineer
> Company located in California
>
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