Electronics Forum | Tue Jun 26 14:28:50 EDT 2007 | bjrap3
I have been trying to rework a lead-free BGA. For some reason, when I remove the BGA the corner pads on the board come off and the board must be scrapped. If I do manage to remove the BGA successfully, when I solder the BGA, the corners of the BGA
Electronics Forum | Fri Jun 29 09:40:46 EDT 2007 | dphilbrick
We have 2 ovens and 2 wave solder machines using nitrogen. When we were running 2 shifts a day 6 days a week we were spending about $3500 per month. Currently running 1 line 5 days a week we are at about $650 per month. These costs include taxes, tan
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 | Thu Jul 12 20:20:31 EDT 2007 | seankim10
I�m having problem with PCB with 16mil thickness due to warpage. the board convex up in the middle after 1st reflow. It seams the warpage is caused by CTE mismatch between PCB and multiple TSOP's, which are covering ~80% of the bottom side board area
Electronics Forum | Fri Jul 13 10:57:04 EDT 2007 | dboudreau
Dear all, we are using the lead-free SN100C solder alloy for wave soldering. We are experiencing wetting problems each time we have to solder a thick board or a board with a large ground plane.I think that maybe we are not using the right flux. I w
Electronics Forum | Mon Jul 23 11:38:20 EDT 2007 | slthomas
"This might have an effect on failed clinch/cuts when the head is inserting in the 90-deg L position." A missing pusher tip would effect everything, I think. If you've got failed cnc's at one rotation, there's something else wrong but I'll be damn
Electronics Forum | Fri Aug 03 02:18:41 EDT 2007 | cadcopac
Hi Steve, I agree with Darby on this your poor operator will be walking a mile a day!!! but if you absolutely want them on the back try this .... in your components listing set the feeder position for all your vib components to a number between 100
Electronics Forum | Fri Aug 10 16:22:35 EDT 2007 | htran
Davef, The J Standard-001-DS(Ref. 4.9.3)does required board assembly bake out and the purpose of the bake out is to demoisturize the PWB and to prevent board delamination during reflow like you have mentioned earlier. Thanks for your inputs. I hav
Electronics Forum | Tue Aug 14 16:26:21 EDT 2007 | slthomas
So it's a C-n-C clearance issue? Could you go with the other cutnclinch unit...which ever you have, get the other one (one's right angled, one's offset at 45�)? Yeah, I know, they're not cheap. Other than that, hand place some of the SMT in chip bon
Electronics Forum | Thu Feb 21 04:41:37 EST 2008 | mun4o
hi,Toni, we use only FR4.Some of PCB we order in China and Taiwan.With these PCBs we can't any problem.Other PCB we order here in Bulgaria.The problems with voids start last year - we have voids only in PCBs from Bulgarian factory.The process is sam
