TECHNET Archives

April 2002

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Randy Bock Sr." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 9 Apr 2002 15:26:22 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (64 lines)
I sent a copy of this to my supervisor.  He has a lot of PWB FAB experience.
Maybe he can come up with a couple suggestions.

Randy Bock Sr.
Quality Manager
Bryce Office Systems LLC
email [log in to unmask]


----- Original Message -----
From: Edward S. Wheeler <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, April 09, 2002 1:59 PM
Subject: [TN] 0402 tombstone problem


> Hi folks, we are running a new board with 0402 parts on it. It seems that
> we are having a tombstone problem as well as a problem with parts not
> staying centered on the pads. We are currently using 20 mil square pads on
> the board, with 20 mils of spacing between them. Our stencil is 6 mils
> thick, laser cut and electro polished. The trapezoidal walled apertures
are
> slightly reduced, 17 mils square, and centered on the pads. It appears the
> chip shooter is placing the parts perfectly. We are using eutectic solder
> paste with an OA flux, and reflowing the parts using the recommended
profile.
>
> Are there any suggestions any of you might have concerning this size of a
> part? Is there a better stencil design, reflow profile, or pad design that
> could help us out? I would appreciate any suggestions.
>
> Thanks.
>
> Ed
>
> --------------------------------------------------------------------------
-------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt delivery of Technet send e-mail to [log in to unmask]:
SET Technet NOMAIL
> To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
> Search the archives of previous posts at:
http://listserv.ipc.org/scripts/wa.exe?S1=technet
> Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
> --------------------------------------------------------------------------
-------
>

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2