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November 2006

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
Date:
Thu, 2 Nov 2006 06:46:16 -0600
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Mornin' Les!

Gracious no! None of our military customers are lead-free...

-Steve- 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - Bogert
Sent: Wednesday, November 01, 2006 5:35 PM
To: [log in to unmask]
Subject: Re: [TN] Bizzare Phenomena...

November 1, 2006

I can offer no help Steve, but can you tell me if your lead-free
customers are military equipment?
  ----- Original Message -----
  From: Steve Gregory<mailto:[log in to unmask]>
  To: [log in to unmask]<mailto:[log in to unmask]>
  Sent: Tuesday, October 31, 2006 9:57 AM
  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://steveze
va.homestead.com/files/Oven_Solderballs.jpg>
   
 
http://stevezeva.homestead.com/files/Oven_Solderballs_2.jpg<http://steve
zeva.homestead.com/files/Oven_Solderballs_2.jpg>
   
 
http://stevezeva.homestead.com/files/Oven_Solderballs_3.jpg<http://steve
zeva.homestead.com/files/Oven_Solderballs_3.jpg>
   
 
http://stevezeva.homestead.com/files/Oven_Solderballs_4.jpg<http://steve
zeva.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-

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