TECHNET Archives

March 2010

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:
vladimir Igoshev <[log in to unmask]>
Reply To:
Date:
Tue, 2 Mar 2010 03:53:33 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (1 lines)
As I've already said to Chris, I'm pretty sure the shape was due to the sample preparation.

Regards,

Vladimir
SENTEC
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca

-----Original Message-----
From: Steve Gregory <[log in to unmask]>
Date:         Mon, 1 Mar 2010 22:33:14 
To: <[log in to unmask]>
Subject: Re: [TN] BTC rework, Square SJs

Hi Chris,

Your pic is up! 

http://stevezeva.homestead.com/files/29903_sn_79_perimeter_a.jpg

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Monday, March 01, 2010 9:27 PM
To: [log in to unmask]
Subject: Re: [TN] BTC rework, Square SJs

Thanks Werner.  Gotcha.  BTCs will keep us in business for awhile.
My biggest concern on this job is that the customer is going to ask "what's
up  with the funny shaped joints?".
It sounds like Bev has the T-shirt already.
I sent a picture to Steve.
Chris

From: Werner Engelmaier [mailto:[log in to unmask]]
Sent: Monday, March 01, 2010 1:56 PM
To: Chris Mahanna; [log in to unmask]
Subject: Re: [TN] BTC rework, Square SJs

Hi Chris,
The problem with this SJ is the low solder joint height 9=reduced
reliability) and the stress concentration geometry from SMD.
Werner



-----Original Message-----
From: Chris Mahanna <[log in to unmask]>
To: Werner Engelmaier <[log in to unmask]>; [log in to unmask]
<[log in to unmask]>
Sent: Mon, Mar 1, 2010 1:08 pm
Subject: RE: [TN] BTC rework, Square SJs
In cross section, the vertical sides of the joint are straight.  I assume it
has more/less retained the shape of the [trapezoidal?] stencil.
Chris

From: Werner Engelmaier
[mailto:[log in to unmask]<mailto:[log in to unmask]>]
Sent: Monday, March 01, 2010 12:52 PM
To: [log in to unmask]<mailto:[log in to unmask]>; Chris Mahanna
Subject: Re: [TN] BTC rework, Square SJs

Chris,
What do you mean by "square joints?"
Werner


-----Original Message-----
From: Chris Mahanna <[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Mon, Mar 1, 2010 12:15 pm
Subject: [TN] BTC rework, Square SJs

Are square joints simply due to the small mass of the components, or is it




















possibly an indicator of insufficient heat?  We have no indication that any
of




















the paste didn't flow.  Wetting looks good.  All evidence is from
microsection.








































Thanks,




















Chris








































______________________________________________________________________




















This email has been scanned by the MessageLabs Email Security System.




















For more information please contact helpdesk at x2960 or
[log in to unmask]<mailto:[log in to unmask]>




















______________________________________________________________________








































---------------------------------------------------




















Technet Mail List provided as a service by IPC using LISTSERV 15.0




















To unsubscribe, send a message to [log in to unmask]<mailto:[log in to unmask]>
with following text in




















the BODY (NOT the subject field): SIGNOFF Technet




















To temporarily halt or (re-start) delivery of Technet send e-mail to




















[log in to unmask]<mailto:[log in to unmask]>: SET Technet NOMAIL or (MAIL)




















To receive ONE mailing per day of all the posts: send e-mail to




















[log in to unmask]<mailto:[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/contentpage.asp?Pageid=4.3.16
for




















additional information, or contact Keach Sasamori at
[log in to unmask]<mailto:[log in to unmask]> or




















847-615-7100 ext.2815




















-----------------------------------------------------









































______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
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/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

ATOM RSS1 RSS2