Doug:
In addition a bold letter heading should
be used for every........*****Headings**** only is what I wrote.
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Wednesday, November 16, 2005 12:19 PM
To: [log in to unmask]
Subject: Re: [TN] Assembly Drawing Notes?
Ramon,
While I don't disagree with you, if you put the "really important stuff"
in Bold Text or otherwise emphasized, how long do you think it will take
before the whole notes section becomes bold face or emphasized?
Doug Pauls
"Dehoyos, Ramon"
<ramon.dehoyos@NG
C.COM>
To
Sent by: TechNet [log in to unmask]
<[log in to unmask]>
cc
Subject
11/16/2005 08:57 Re: [TN] Assembly Drawing Notes?
AM
Please respond to
TechNet E-Mail
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; Please respond
to
"Dehoyos, Ramon"
<ramon.dehoyos@NG
C.COM>
I believe that many drawing are very difficult to read. For
example there will be some notes about conformal coating on an area (
i.e. note 8 )and add-ons about the same matter on note 37 and 45. The
drawing should be planned from the beginning. Lets say note one should
be used exclusively for hardware type of issues on all drawings. Note
two for type of ink or labeling instructions and so on, so that a
drawing can be easily followed. In addition a bold letter heading should
be used for every note, such as ****PCB MATERIAL**** or ****CONFORMAL
COATING*** There is no bold letter option so I am using the * asterisk
symbol.
It is just one man's opinion.
Ramon
-----Original Message-----
From: TechNet [mailto:[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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