Electronics Forum | Tue Feb 15 18:03:56 EST 2000 | JAX
Dane, I'll give you a quick guess before I log off; The reason you are seeing problems with dome shaped fiducials is probably because the machines in question do not use grey scale recognition. They asign either black or white( not 256 shades of grey
Electronics Forum | Mon Feb 14 11:58:30 EST 2000 | JAX
Steve, I have just one question. Do you place any other QFP's that have 20mil pitch or less? Do you see the same problems? You might be able to solve the problem using other methods. If not, will the ENIG finish on the boards be a profitable move. I
Electronics Forum | Fri Feb 18 09:12:13 EST 2000 | Leslie Hall
Thanks Dave F for you 2 cents. You bring up some important points that what one person is doing isn't neccesary right for us. Someone might burn in their boards for 10 hours in temperature but their ramp time is only an hour versus someone else is
Electronics Forum | Fri Feb 11 05:43:21 EST 2000 | Wolfgang Busko
Hi Russ, I thought about it and what approach I would do. All that talk about causes and reasons doesn�t solve the problem. To determine wether it�s the PCB, the component or the process I would take a bare board, a component ( and maybe a different
Electronics Forum | Wed Feb 09 08:54:42 EST 2000 | pascal MATHIEU
Hello friends , in order to try to reduce our labour cost , we are thinking to replace manual placementof PTH COMPONENTS by automatic unit which 'll be able to place relays ,and connectors . is there anybody on this forum to advise us on this topi
Electronics Forum | Sat Jan 06 10:24:33 EST 2001 | Dave F
Some NC fluxes work well with conformal coatings others do not. Your coating materials supplier should be able to help. If they can't you're talking to the incorrect person. Try our friend Graham.Naisbitt@concoat.co.uk www.concoat.co.uk CONCOAT Lt
Electronics Forum | Wed Dec 13 18:41:33 EST 2000 | Steve A
Chris, I am not a chemist, but my best guess would be that you were able to remove some of the solvents from the paste flux without exhausting too much of the activators. The loss of solvents could have cut down on violent boiling (violent boiling
Electronics Forum | Wed Dec 06 13:47:15 EST 2000 | JAX
Nick and Dave, Did I miss the question? What does it matter what pattern the glue dots are in, whatever vision you use will have to read the individual dots anyway. If your glue machine is any good you should be able to get away with simply
Electronics Forum | Thu Nov 30 15:18:54 EST 2000 | Rich Z
All, I have a reoccurring issue with the Alpha-Metals WS601, water-soluble paste in that the size 20 nozzle of the auger-type dispenser on my Camalot Gemini II clogs up rather frequently. Every few hours we are having to go in and clear out the nozz
Electronics Forum | Thu Nov 02 09:45:00 EST 2000 | bierleinb
I would check trace-pad interactions as you may be robbing heat from one of the pads causing uneven heating during reflow. Also, measure paste deposits on trouble parts to see volume depsoted across the pads. You should easily be able to do 0402s w
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