TECHNET Archives

September 2008

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:
Reuven Rokah <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Reuven Rokah <[log in to unmask]>
Date:
Mon, 8 Sep 2008 16:25:34 +0300
Content-Type:
text/plain
Parts/Attachments:
text/plain (1 lines)
You can check also the symmetric thickness and materials in z axis to the center line



Best Regards



Reuven ROKAH

e mail: [log in to unmask]

Think green before printing this mail... Thanks



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Herminia Guevarra

Sent: Monday, September 08, 2008 4:04 PM

To: [log in to unmask]

Subject: Re: [TN] Bow and Twist Measrement - [(Could Be SPAM- Header Check)] Email has different SMTP TO: and MIME TO: fields in the email addresses



Just had a recent bow issue and PCB vendor cited root causes were

unbalance copper residual between left and right side dummy and

unbalance pressure distribution in lamination process. A PCB may appear

to have a slight bow prior to reflow, and will have a progressively

greater bow after each assembly reflow cycle. FYI.



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo

Sent: Monday, September 08, 2008 8:44 AM

To: [log in to unmask]

Subject: Re: [TN] Bow and Twist Measrement - [(Could Be SPAM- Header

Check)] Email has different SMTP TO: and MIME TO: fields in the email

addresses



Bow and twist in excess spec normally indicated either poor design .l

unbalenced layout, or poor qual of Mfg, or both.

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

Sent using BlackBerry





----- Original Message -----

From: TechNet <[log in to unmask]>

To: [log in to unmask] <[log in to unmask]>

Sent: Mon Sep 08 06:00:09 2008

Subject: Re: [TN] Bow and Twist Measrement



Though IPC 610D sections 10.2.7 mentioned acceptable for class 1, 2 and

3 as long it does not cause damage during post solder assembly

operations or end use. Consider "form, fit and function" and product

reliability.  Only IPC 600 (raw PCB) mentioned it is not acceptable.



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood

Sent: Monday, 8 September 2008 4:21 PM

To: [log in to unmask]

Subject: Re: [TN] Bow and Twist Measrement



I agree

A lot of machines won't cope with the bow and twist permitted in the

standard.

Rex





Rex Waygood

Technical Manager



PartnerTech Poole Ltd

Benson Road

Poole

Dorset BH17 0RY

United Kingdom



Tel: +44 (0)1202 674333

Fax: +44 (0)1202 678028

DDI: +44 (0)1202 338222

Mob: +44 (0)7887 997403



[log in to unmask]

www.PartnerTech.co.uk



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard

Sent: 05 September 2008 18:58

To: [log in to unmask]

Subject: Re: [TN] Bow and Twist Measrement



The tighter one.  Surface mt.

You need to gear it to the component most susceptible to damage from

Warp/Twist



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani

Sent: September 5, 2008 11:53 AM

To: [log in to unmask]

Subject: [TN] Bow and Twist Measrement



Hello All,







IPC-A-610 Rev. D, Section 10.2.7 allows 1.5% and 0.75% Bow and Twist for

Through-hole and surface mount assemblies accordingly. What percentage

should I be applying if the assembly has mixture of surface mount and

through-hole components?







Thank you in advance,



Paymon Sani





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

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

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



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

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

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



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

-------



The information contained within this e-mail and any attachments

contained therein may be confidential and/or legally privileged and is

for the use of the intended recipient only. If you are not the intended

recipient please delete it from your system and notify the sender by

return e-mail. The content of this e-mail may not be copied or disclosed

to any third parties without prior permission from the sender.







E-mail is susceptible to data corruption, interception, tampering and

viruses. We do not accept any liability for any such incidents or any

consequences thereof.

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

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

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



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

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 transmission (including any attachments) may contain confidential

information, privileged material (including material protected by the

solicitor-client or other applicable privileges), or constitute

non-public information. Any use of this information by anyone other than

the intended recipient is prohibited. If you have received this

transmission in error, please immediately reply to the sender and delete

this information from your system. Use, dissemination, distribution, or

reproduction of this transmission by unintended recipients is not

authorized and may be unlawful.



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

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

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



8/9/2008NOT INTENDED AS A SUBSTITUTE FOR A WRITING



NOTHING IN THIS E-MAIL, IN ANY E-MAIL THREAD OF WHICH IT MAY BE A PART, OR IN ANY ATTACHMENTS THERETO, SHALL CONSTITUTE A BINDING CONTRACT, OR ANY CONTRACTUAL OBLIGATION BY PNY, OR ANY INTENT TO ENTER INTO ANY BINDING OBLIGATIONS, NOTWITHSTANDING ANY ENACTMENT OF THE UNIFORM ELECTRONIC TRANSACTIONS ACT, THE FEDERAL E-SIGN ACT, OR ANY OTHER STATE OR FEDERAL LAW OF SIMILAR SUBSTANCE OR EFFECT.  THIS EMAIL MESSAGE, ITS CONTENTS AND ATTACHMENTS ARE NOT INTENDED TO REPRESENT AN OFFER OR ACCEPTANCE OF AN OFFER TO ENTER INTO A CONTRACT.  NOTHING IN THIS E-MAIL, IN ANY E-MAIL THREAD OF WHICH IT MAY BE A PART, OR IN ANY ATTACHMENTS THERETO SHALL ALTER THIS DISCLAIMER.



This e-mail message from PNY Technologies, Inc. is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.



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

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

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


ATOM RSS1 RSS2