Electronics Forum | Tue Sep 11 09:13:01 EDT 2001 | davef
Like most things in electronic assembly, this is not astrophysics. People have pasted boards, placed components, turned the board up-side down, run the board through a reflow oven, and generalized about which components: * Fall off the board. * Don
Electronics Forum | Wed Sep 05 14:53:45 EDT 2001 | Jeff Meier
We have customers that are requiring no flux residue left on boards after soldering of non-water washable parts. We currently use Multicore Crystal 502 No-Clean to solder parts that are not washable. Has anyone come up with a good way to remove this
Electronics Forum | Thu Sep 06 09:49:26 EDT 2001 | ksfacinelli
This is a real problem. We have experimented with a number of off the shelf products as well as discussed the issue with a few solder manufacturers. As you are aware IPA or Flux off can make the product look worse. I would discuss with the custome
Electronics Forum | Thu Sep 06 21:03:29 EDT 2001 | Poon Man
Eric, There are a lot of factors leading to lose components. Suppose your machine works properly. Firstly, is there any gap between the support pins and PCB? If yes, the components may be �dancing� during placement. Have you checked the placement s
Electronics Forum | Fri Sep 07 07:39:11 EDT 2001 | caldon
Can you confirm the components are being picked up from the feeders? If the Feeder table calibration is incorrect the components could be picked up off from the begining. This would result in 1) nozzle barely picking up the part and as the head moves
Electronics Forum | Fri Sep 07 08:47:45 EDT 2001 | Hussman
Board support will almost always cause the part to be miss-mounted. The bouncing affect of the board can cause the part to bouce off the board. BUT, you never stated where the ends up or anything like that. Is the part on the board but just floppi
Electronics Forum | Sun Sep 09 14:34:50 EDT 2001 | darburch
Eric Whenever I see a board come out of the chipshooter missing parts the first thing to check is the support pins. However if you have checked table and part height I assume that you have also checked the pins. So the next thing to check is the vac
Electronics Forum | Fri Sep 07 10:46:23 EDT 2001 | davef
Comments are: * Sn42Bi58 is eutectic at 138�C. Most top-flight paste suppliers will produce it for you. * Bismuth forms an alloy with lead with a melting point of 93�C * Maximum temperature of the solder connection should be less than 100�C during
Electronics Forum | Mon Sep 10 02:47:27 EDT 2001 | Peter W.
Thank you for your annotaions. I am aware of the limits and temperatures of that material, but we are doing some research with thermoplastic base materials which won't survive standard solder paste reflow soldering. And beside of using conductive ad
Electronics Forum | Wed Sep 12 21:16:23 EDT 2001 | raton
The quip; All you can get! By the way, worthy answers above, especially Dave F getting a little tied up is good to see, he's always on the money otherwise. But seriously, watch for damage to other components. Example; thru hole's such as radial c
