Electronics Forum | Fri Dec 20 11:32:51 EST 2002 | D. Adams
Check your stencil apertures making sure they are trapazoidal and smooth. I have hadjobs where the laser stencil was improperly cut (poor laser settings leaving a rough hole even after electropolish. Be sure to specify a .0005 trapazoid in your ste
Electronics Forum | Mon Dec 16 15:10:56 EST 2002 | Randy Villeneuve
We do not bake any of our boards prior to wave solder. If we did we would have one heck of a large oven. I would assume you are concerned about moisture sensitive components. In most cases your top side parts should only get to 80 degrees centigarde
Electronics Forum | Tue Dec 17 18:44:13 EST 2002 | davef
Two suppliers of singulation machines are: * Wand 847.459.2400fax2421 * Circuit Technology 847.705.2140fax2141 Search the fine SMTnet Archives for additional discussion. Also, look here: http://www.assemblymag.com/execute-vSection-Articles-vSu
Electronics Forum | Tue Dec 17 09:48:44 EST 2002 | russ
Temps are related to the components/PCBs being soldered. I am not aware of any Industry standard. If you are soldering flex circuits, .020" boards etc.. We use 500 deg tips a little thicker PCB/lead we go to 600, and so on. We never exceed 800 in a
Electronics Forum | Wed Dec 18 11:32:22 EST 2002 | johnw
The other thing to look at is the component spec, most will state a max, e..g SMT ceramic Caps are actually rated to be hand soldered at 500F!... fine if it's a light PCB but if it's a big thing with lot's of grounding.... Teh component suppliers re
Electronics Forum | Tue Dec 17 11:01:24 EST 2002 | Tim Marc
Hello all, One of our PCB manufacturers coated a through hole connecters vias with solder mask. The only IPC references that comes close to describing this problem is 2.9.2 Registration to holes, and subsequent specification 6.3.1 PTH � Vertical fil
Electronics Forum | Tue Dec 17 17:47:49 EST 2002 | Tim Marc
Dave, I�m talking about the 75% vertical fill of solder IPC 6.3 criteria (B), and 6.3.1 Fig 6-5. I also referred to the annular ring of the Plated-Through-Hole, being coated with solder mask. Semantics, yes I did refer to the Plated-Through-Hole (Sup
Electronics Forum | Wed Dec 18 09:04:29 EST 2002 | russ
Dave, You stated that an unfilled via is of greater strength than a filled or partially filled via. I posted to another thread recently and I stated that a filled via was of greater strength than an unfilled. I was tought (incorrectly?) that a fill
Electronics Forum | Thu Dec 19 10:52:12 EST 2002 | bremerg
Does anyone have experience using Sn43Pb43Bi14 solder on high reliability circuit boards that are subjected from -55� Celsius to +85� Celsius? What companies/industries are using this solder? Does anyone have detailed information on what the proper
Electronics Forum | Thu Dec 19 12:08:01 EST 2002 | davef
Facts!!! I got facts. Mechanical strength experiments of Sn43/Pb43/Bi14: �Microstructural And Mechanical Characterization Of 43/43/14 Tin/Lead/Bismuth�; J. Marshall, J. Calderon, J. Sees; Soldering And Surface Mount Technology; 10/91, p25-27 Look
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