Electronics Forum | Fri Apr 06 16:36:39 EDT 2007 | mika
Ah, I almost forget (forgot?) to mention that according to the Gerber files (which is the info we send to the PCB-house) the PCB land pattern for this LGA-36 0.35mm rounded pads and the boardhouse cannot achieve this. I understand them; 0.35mm pads,
Electronics Forum | Mon Apr 30 12:17:49 EDT 2007 | stepheniii
The US told him he can not buy American. He and I never said that there is anything wrong with buying American. The fact is the US government says he cannot buy American. He needs equipment. The US government says he can't buy American, therefore he
Electronics Forum | Mon May 21 09:06:33 EDT 2007 | davef
Pat: Very descriptive SUBJECT choice. Surface tension: * Soldering and Surface Tension; Champion, JA; Physics Education, V 16, No 2, 1981, pp 98-100(3) Institute of Physics [We have not looked at this, so we cannot comment, but it seems like an appr
Electronics Forum | Thu May 31 19:45:47 EDT 2007 | diesel_1t
We place a QFP 256 leads 20 mil pitch, had a lot of troubles with shifted components and solderability issues. solderability is not a problem anymore; we solved with a ramp-to-spike profile with .9�C/s 'til 183� then spike to about 118�C, TAL ~60s. W
Electronics Forum | Mon Jun 18 11:54:35 EDT 2007 | grantp
Hi, The problem seemed to be across multiple batches of boards, so I think they were made correctly, and we don't use a carrier in the reflow oven. However we just moved our equipment to the new factory yesterday, and connect and start turning on
Electronics Forum | Sat Jun 23 11:35:58 EDT 2007 | grantp
Hi, Yes, we just built a new plant, and used copper again. The stuff we cut out of the old building was copper, and it was fine without any issues. We lay it on an angle so condensation flows to an end, and can be periodically vented, and we take a
Electronics Forum | Fri Jul 13 19:35:02 EDT 2007 | hegemon
We have had good success doing pb Free QFN work. Typically for the center pad we use ~68% coverage with 1:1 ratio on the perimeter pad. For the 68% coverage we have tried cross hatch pattern, diagonal stripes, dot series, and most successfully a clo
Electronics Forum | Fri Aug 24 09:26:59 EDT 2007 | bentigano
Well, everything works with UCT52 on WinXP, except Components Library and Pattern Program Data in the Main Menu. I can communicate with the machine back and forth for management data, and nozzle data, but I cannot send NCZ programs over, or interact
Electronics Forum | Fri Aug 17 09:35:15 EDT 2007 | karenp
We usually do Solder reworks, and some components that cannot be installed by SMT Machines or Wave solder due to specs or the technology in our company... aur work methods and instruction are always based on designators and are more illustrated to ca
Electronics Forum | Sun Aug 26 07:13:05 EDT 2007 | callckq
Hi Experts, Understand from my friends, PTH crystal can get damage easily when subject to vibration or heat..For example, if crystal drop from table to floor, its internal part already damage @ crack which cannot be seen by eye. Besides, they als
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