TECHNET Archives

October 2006

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:
Lance Mayes <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lance Mayes <[log in to unmask]>
Date:
Tue, 31 Oct 2006 09:36:38 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (103 lines)
Steve,

I could use some for fly fishing weights if you 're going into the
business.


P. Lance Mayes  CIT
Mfg.  Trainer



Steve Gregory <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/31/2006 07:59 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Steve Gregory <[log in to unmask]>


To
[log in to unmask]
cc

Subject
[TN] Bizzare Phenomena...






Mornin' All!

This morning I have seen something that I have never, ever have seen
before. It's been a little slow the past week, so we decided to do our
maintenance on our reflow ovens. After we opened the oven up, we found
many, many solderballs laying on the bottom of the oven right around
zone 7 - 8, right at the beginning of the spike zone. Check-out:

http://stevezeva.homestead.com/files/Oven_Solderballs.jpg

http://stevezeva.homestead.com/files/Oven_Solderballs_2.jpg

http://stevezeva.homestead.com/files/Oven_Solderballs_3.jpg

http://stevezeva.homestead.com/files/Oven_Solderballs_4.jpg

We've been having tombstoning problems when we've run the two lead-free
jobs that we have here. I've been working with the paste vendor sending
my profiles and plots, but I haven't been able to solve the problem. The
solderballs in the oven are lead-free solderballs.

We are using a Heller 1809, and my profile set-points are:

120    140    160    180    190    200    230    240    250
120    140    160    180    190    200    230    240    250

Belt speed 26 in per min

The paste is a SAC 305 with a water washable no-clean flux. I think my
profile is pretty reasonable, and the last board we ran is pretty
standard, .062" thick, with no bizzare copper planes. The board finish
with both jobs has been ENIG. The last job I ran we were tombstoning
0805's, the one before that we were tombstoning 0402's. With both jobs
we've had major tombstoning problems. I've slowed the beltspeed down,
sped it up, ramped up slower, ramped up faster, changed this, changed
that, but still haven't resolved my tombstoning.

Of course, I'm the only one that's having this problem according to my
paste vendor...

I wouldn't have imagined that I would see the solderballs in the oven
like we have...

Have any of you ever seen something like this before?

-Steve Gregory-

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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 1.8e
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