Electronics Forum | Fri Apr 25 11:38:22 EDT 2008 | vortex337
Our company has run into an issue with de-wetting of lead free components. Our profile is dead on with paste manufacturers specs. We have had this issue with both gold immersed, and hot air leveled boards. We have tried three different solder paste m
Electronics Forum | Tue May 13 08:26:29 EDT 2008 | davef
First, on your reflow temperature comment: The 183*C focus for reflow recipes for tin-lead solder is a falicy. If you held a recipe for tin-lead solder at 183*C peak, it would never reflow. Recipes for tin-lead solder need to be at liquidus plus 20*C
Electronics Forum | Sat Jul 26 12:04:32 EDT 2008 | davef
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Electronics Forum | Mon Aug 04 21:50:24 EDT 2008 | jti
We're running only our second job on our newly aquired Juki 740 The problem I'm having is as follows, I program the locations, component info, pick info, all fine. When I have the machine measure the component, everything comes up fine, it returns t
Electronics Forum | Mon Aug 25 15:40:58 EDT 2008 | dyoungquist
I am seeing poor quality solder joints, mostly on 0402 components. The problem is that while the pad on the pcb is getting fully wetted, the solder is not flowing up the sides of the 0402 component, i.e. the 0402 lead is somewhat de-wetting. The re
Electronics Forum | Mon Sep 01 04:55:20 EDT 2008 | benefon
Hello all Our Omni 5 has given the 'Cooling module high temp' warning twice during the past month. I suspect that the blower motor is the culprit but have not been able to verify this because the oven has started up normally after acknowledging the
Electronics Forum | Tue Sep 02 15:35:55 EDT 2008 | modernprecison
I have a Siemens S-27 and I'm having occasional issues with 0201 components in particular. I'm using the 12 segment head and 902 nozzles with them. I'm making sure the magnet is clean of debris and the feeder is sitting flat. Most of the time they
Electronics Forum | Thu Oct 02 16:22:46 EDT 2008 | davef
Not all paste formulators offer suggestions on handling the storage of opened paste jars, but some do. Here's a couple. Storing Opened Solder Paste Containers * Once a jar or cartridge has been opened it should not be re-refrigerated. If solder past
Electronics Forum | Mon Oct 06 15:17:12 EDT 2008 | davef
Q1: You say that 0.008" of "slop" is un-doable; hence, the reasons for our failures. Any basis for that statement? A1: We're not even considering the accuracy of your placement machine. We base our comments on the gap between the hole and the connec
Electronics Forum | Wed Nov 19 20:07:05 EST 2008 | davef
First, it's GREAT to have a long-term lurker posting here on SMTnet. Maybe this will encourage other lurkers to join us. [We'll try to be on our best behavior.] Second, while Stephen Pence's explanation of 'equivalence factors' is accurate, your con
