Electronics Forum | Thu Jun 14 11:26:30 EDT 2007 | mumtaz
It may be your screen printer my friend. You are using a MPM aren't you? I knew it. Try a DEK to rid yourself of these pesky problems.
Electronics Forum | Fri Jun 15 08:53:02 EDT 2007 | ed_faranda
I remember seeing that formula, but looking through my notes, I can't find it. My R&D group is starting to bigger and bigger parts on the bottom side. Could you please email or post that formula?
Electronics Forum | Thu Jun 14 09:37:50 EDT 2007 | jdumont
Nice! Always love to hear people using the Trieber. Sadly, I had to retire mine in favor of a new Electrovert recently. Good luck with it...
Electronics Forum | Thu Jun 14 10:49:35 EDT 2007 | sueph
Thanks for the reply guys. One other thought, one of the engineers suggested that this could shorten the life of the solder pot itself. Granted, this is an old machine. What do you think??
Electronics Forum | Thu Jun 14 20:03:42 EDT 2007 | davef
If you're concerned, consider reducing the period used to monitor pot temperature in your process monitoring. Then, if you observe temperatures that ramp out of control more often than you expect, it might confirm the suspicion about damage to your
Electronics Forum | Mon Jun 18 10:34:40 EDT 2007 | swag
If you are using a fixture/carrier in the oven, make sure that it is not too restrictive on the perimeter of the board/panel. A carrier intended to limit warpage can actually cause warpage if the expanding PCB material has no place to go during refl
Electronics Forum | Mon Jun 18 14:46:24 EDT 2007 | ck_the_flip
I have heard that with lead free soldering, the cooldown phase is NOT as critical as it is for Tin-Lead. -2�C per second cooldown is good enough to form a good solder joint with good grain structure.
Electronics Forum | Sun Jun 17 02:19:47 EDT 2007 | Frank
You can grab a measuring tape and get the size yourself. Those machines are pretty small, I can't see them weighing more that a few hundred pounds. Contact Juki (the real makers of those machines) and I am sure they could dig up the actual weight.
Electronics Forum | Mon Jun 18 02:15:20 EDT 2007 | pavel_murtishev
Good morning, 5mil stencil or less would be appropriate. We deal with 0402's daily and 5mil works. BR, Pavel
Electronics Forum | Mon Jun 18 10:02:26 EDT 2007 | dyoungquist
5mil should work fine. Some stencil manufacturers charge more if you go less than 5mil so stick with 5mil.
