Electronics Forum | Wed Oct 11 16:05:16 EDT 2000 | NLykus
Does anyone have any experience with running a double sided/surface mount(bottom)board manufactured with CHEM 1 material? We are currently looking at cost cuts. My personal experience recently in running a D.O.E. against other materials and solder
Electronics Forum | Thu Jul 20 14:07:23 EDT 2000 | JohnW
Mike, we use carrier's as a matter of course on all wave products, it let's us keep the conveyor width the same all the time so speed's up change overs and eleimiates one more thing that can be set wrong. The main aim of the exercise is to be able
Electronics Forum | Tue Feb 22 11:53:16 EST 2000 | JAX
Sal, To answer your first statement; Yes, you can cure paste and reflow solder using one profile. Question on your second statement; Are you talking about running passive side glue, flipping it over, running active side solder, and then putting the
Electronics Forum | Fri Apr 16 13:15:17 EDT 1999 | Justin Medernach
| Hi, | I just cheesed my previous attempt at this. I looked through IPC 600 and couldn't find anything relating to dimensional stability of a board with regard to stretch. I found bow and twist but nothing on size. I have a PCB that is .030" over
Electronics Forum | Thu Nov 19 10:24:14 EST 1998 | Brian Co nner
Currently, I am having problems with a AMP Mictor connector at the wave process. These connectors have both SMT leads(topside) and thru-hole leads. Even though we have re-designed the board for via issues. We still see some of the SMT leads re-fl
Electronics Forum | Mon Oct 29 18:21:43 EST 2001 | slthomas
We recently have received a lot of warped (bowed and/or twisted behond IPC 600 specs.) bare boards (some our fabricator's fault, some ours by design) and I can't help but figure that long term reliability will suffer when building product with them.
Electronics Forum | Wed Jun 26 21:05:15 EDT 2002 | ianchan
Hi Dave F, customer calls it "warp", we can call it "twist/bow"..etc. the "warp" occurs on individual PCB cells of 28per each panel. the overall dimension of the panel is 139mm x 168mm, and each individual PCB cell is 2.4mm x 1.2mm. Thickness is 0.
Electronics Forum | Fri Sep 13 14:33:32 EDT 2002 | Simon
Thanks to all of you. This is very kind. I'll have a good poke around the circuit board for loose / hot components - good tips. I think it might be a throw away job, but I thought I'd give it a last try. You guys have actually given me much more
Electronics Forum | Fri Jan 31 13:55:56 EST 2003 | MA/NY DDave
Hi I hope I am on point based on my reading. The outer edges bow spec depends on a gradual deformation that finally builds up to the outer edges. If you mathematically move this deformation back you will have allowable deformation at the point you
Electronics Forum | Thu Feb 27 12:27:10 EST 2003 | stevel
Hi all, We got some bare pwb in our incoming inspecion looked really wrapped. The maximum twist of the pwb we messured is 0.056inch by following the method in IPC-TM-650 2.4.22 C. (The diagonal size of our pwb is 7.5inch) According to the IPC standa
