I've just expended my "good idea" quota. I'm done for the year <grin>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Wednesday, November 16, 2005 10:41 AM
To: [log in to unmask]
Subject: Re: [TN] Assembly Drawing Notes?
Excellent idea, like the commercial says: Brilliant!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Wednesday, November 16, 2005 10:35 AM
To: [log in to unmask]
Subject: Re: [TN] Assembly Drawing Notes?
To make drawings less cluttered we have resorted to calling out a QMS
(Quality Management System - internal ISO-9001 document) with all the
"default" board attributes with any exceptions noted on the prints.
This allows us to change one document and affect all product and keep
the notes from becoming overwhelming.
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Wednesday, November 16, 2005 9:55 AM
To: [log in to unmask]
Subject: Re: [TN] Assembly Drawing Notes?
Mike,
I would also mark:
* any reference to internal standards
* instructions clarifying any funky ECO, that adds parts
non-existent in the artwork, that are assembled in weird positions. If
this is not the case, I would still mark a history of the revisions and
the ECO numbers
* any reference to instructions on components that have special
forming
* who provides the serial number structure (customer or CEM) and
reference to the documentation on how to create the labels
Besides that, I will revise our instruction set, to include some of
Richard's notes.
Regards,
Ioan
> -----Original Message-----
> From: TechNet [SMTP:[log in to unmask]] On Behalf Of Stadem, Richard
> Sent: Wednesday, November 16, 2005 9:25 AM
> To: [log in to unmask]
> Subject: Re: [TN] Assembly Drawing Notes?
>
> Hi, Mike.
> Here are some other standard notations, if they apply.
> All finished dimensional limits, such as maximum component height, to
> avoid any interference fit issues. Maximum lead protrusion for any
> through-hole parts. Conformal coating type, method of application,
> hardness, and keep-out areas. Which components are to be epoxy staked,
> and method (spec number). If flipchips are present, the requirement
for
> underfill and globtop should be in the notes. Torque settings for
screws
> and other hardware are often overlooked. Some people put programmed
part
> notations on the drawing, so the documentation person does not
overlook
> that step on the traveler or routing (nothing worse than having
several
> hundred assemblies built up with Eproms not yet programmed). Design
0,0
> point and XY coordinates of tooling holes is standard on all assembly
> drawings. Thermal heatsinks should be noted on components that require
> them, and the thermal grease, sil-pad, etc. noted.
> Pin 1 notations (connectors) should be noted, and polarity should
always
> be easily seen. The location for marking the serial number, revision,
> and the method is standard boilerplate. Handling to an ESD spec and to
> an MSD spec and the appropriate Mil-handbook is always noted, and the
> ESD symbol is on every assembly drawing with ESD parts.
> And of course, the revision history and ECN listing must be on every
> drawing. Statements of proprietary, classified information, copyright,
> and ITAR warnings should be present if they apply. Dimensions are to
be
> noted as to millimeters or inches. Method of creation is always a good
> idea (Mentor Graphics EN2004, for example).
> I'm sure I've missed something here, but that is all I can think of.
Any
> others out there?
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael McMonagle
> Sent: Wednesday, November 16, 2005 7:32 AM
> To: [log in to unmask]
> Subject: [TN] Assembly Drawing Notes?
>
> We are updating some PCBA assembly drawings, and looking for a little
> guidance on notes to include on the drawings. Current standard notes
> include:
>
>
>
> - Solder alloy required
>
> - Assembly processes to be in accordance with latest rev
> ANSI/J-STD-001 Class XX
>
> - Workmanship to be in accordance with latest rev IPC-A-610
> Class
> XX
>
>
>
> Other than additional notes for idiosyncrasies specific to a given
> assembly, are there any other 'boilerplate' notes we should
incorporate?
>
>
>
> Mike McMonagle
>
> Quality Engineer
>
> OYO Geospace
>
> 7007 Pinemont Drive
>
> Houston, TX 77040
>
> 713-986-8650
>
>
>
>
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