TECHNET Archives

May 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:
"Croslin, Robert" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Croslin, Robert
Date:
Thu, 29 May 2008 08:59:24 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (261 lines)
Gaby, thanks.  That's a condition we hadn't taken into consideration
before, but certainly will in the future. 


Bob

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gabriela
Sent: Thursday, May 29, 2008 12:37 AM
To: [log in to unmask]
Subject: Re: [TN] PTH's With Immersion Silver

Robert, 

I had a similar problem when we switched circuit manufacturers.

The drawing of the circuit had a specific final diameter requirement for
the connector holes and the plating was at first HASL. As you know, due
to the thickness of the HASL coating, the drilling diameter is a bit
larger in order to allow the final dimensions to match the requirement.
So, at first, we received circuits with holes within tolerances coated
with a thick soft coating. This allowed the easy connector insertion
with eventual deformation of the coating.

When we switched to another manufacturer with immersion silver , the
drilling diameter of his holes was smaller, because he had to perform a
thin finish, practically with no thickness addition to the copper.

The final diameter was the same, but insertion was difficult- the HASL
coating is somehow like a lubricant, immersion silver is not.
Gaby

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert
Sent: Tuesday, May 27, 2008 9:57 PM
To: [log in to unmask]
Subject: Re: [TN] PTH's With Immersion Silver

 

Lee and all, thanks very much.  I've just sent a summary of the

responses to our CM and have asked for cross sectioning to be done.

Regardless of the "why" there's a very nice, but frustrated operator

named Carla on the production line having fits trying to insert tab A

into hole B and I've got to fix that before the next run.

 

Thanks for all the help! 

 

 

Bob

 

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

From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Parker

Sent: Tuesday, May 27, 2008 3:53 PM

To: [log in to unmask]

Subject: Re: [TN] PTH's With Immersion Silver

 

Robert

 

This is very bizarre.

 

I worked for Bell Laboratories many years and installed the first

immersion silver line in North America in the AT&T PCB facility. We ran

thousands upon thousands of boards through the process. We never had a

problem with undersized holes. I suggest you cross-section some holes

and measure the drilled hole diameter. Also, perhaps the fabricator

placed a layer of some foreign material (i.e. nickel) between the copper

and the silver or perhaps over-plated the copper.

 

Best regards

 

Lee

 

J. L. Parker Ph.D.

JLP Consultants LLC

(804) 779 3389

 

 

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

From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert

Sent: Tuesday, May 27, 2008 10:57 AM

To: [log in to unmask]

Subject: [TN] PTH's With Immersion Silver

 

We've been using immersion silver on our boards for quite a while with

great success, but in a recent run of a new product, we had the boards

come in with the PTH's used to mount RCA and audio connectors smaller

that usual.  The parts came in on the large end so it became very

difficult for the operator to insert them into the board.  Both holes

and parts were in tolerance and the holes were specified at the

recommended diameters.  Our CM has a woman who spent 20 years working in

pcb fab houses and she tells me that it's not at all unusual to have IS

boards with reduced ID's on the holes as opposed to HASL.  Has anyone

else experienced this?  If this is the case, we'll have to adjust for

this in the future, but it would be useful to know if this was an

anomaly or a normal condition?

 

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

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

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

 

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

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

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