Electronics Forum | Sat Sep 27 19:41:55 EDT 2014 | cyle
In my office we strive for no retouch prior to reflow, it can be done, you just need your operator to be competent enough to know how to set up your machine correctly. I would say 99% of parts that are misaligned are user error, they are either not
Electronics Forum | Fri Mar 18 14:21:02 EST 2005 | Dreamsniper
We are producing control products for the Aerospace Industry both Commercial and Military. I have TQFP 100 fine Pitch in one of my PWB's Solder Side and have no misalignment problems or defects on my part after 2nd reflow. I control my reflow profile
Electronics Forum | Wed May 31 22:17:24 EDT 2006 | EC
Hi Jack, I do not know what type of machine you are using and how old is your machine. But I have this problem before using Fuji machine. There are few things cause part throw.....placment speed, feeder, pick up tolerance, part dimension tolerance,
Electronics Forum | Thu Dec 07 13:51:59 EST 2006 | ganoi
I need advices as to how a gap between the bottom of an LED (1209-package) and the PCB can be controlled on a small rigid-flex PCBA? The problem that we experience is due to tight tolerance in the design of our molded housing in which this PCBA is as
Electronics Forum | Thu Dec 07 19:20:28 EST 2006 | ganoi
Most likely there is movement during reflow. How about conduction oven over convection oven for reflow? This is a small PCB with the LED sitting on a Flex-Rigid extension from the PCB. I was thinking if the stencil aperature for the LED was to be cu
Electronics Forum | Mon Jan 31 19:10:17 EST 2022 | chuckphd53
Thanks for the reply... I have two camera types Low Res and Hi Res... I use the Low Res which is just for the 'absence' of part ie. empty feeder etc so it just makes sure the part got picked up... I could try the High Res camera, but it does increa
Electronics Forum | Wed Nov 18 10:39:48 EST 1998 | Scott Lolmaugh
| | | Does sombbody know what DPM rate a good and reliable SMT assembly line (incl. solder paste print, assembly and feflow soldering) has? | | | | | Chris, | | It may be helpful if you could translate DPM into a meaningful phrase as many people (my
Electronics Forum | Wed Jul 25 23:35:18 EDT 2001 | mugen
my guys SOP : Round #1 1) take double-side tape, and peel it flat to the PCB. 2) process this PCB only through P&P SMT. 3) confirm the SMD placement Round #2 4) take thin plastic sheet and tape corners flat to the PCB. 5) solder paste print over t
Electronics Forum | Wed Jul 25 23:37:11 EDT 2001 | mugen
my guys SOP : Round #1 1) take double-side tape, and peel it flat to the PCB. 2) process this PCB only through P&P SMT. 3) confirm the SMD placement Round #2 4) take thin plastic sheet and tape corners flat to the PCB. 5) solder paste print over t
Electronics Forum | Thu Jan 04 17:04:43 EST 2007 | slthomas
99% good solder joints = 10000 ppm (defects per million opportunities). Having only built with 0603s I can't speak for a target but that still seems pretty harsh....with a 75/25 0805/0603 ratio at my last place of employment I think we were running
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