Electronics Forum | Fri May 29 20:15:15 EDT 1998 | Steve Gregory
Whoo-doggies Jason, you said a mouthfull!! (GRIN) Anyways, 'member what I said about me being a pack-rat? Guess what? I found some documentation that I've had for a while that does document the self-alignment forces that goes on when reflowing. I ha
Electronics Forum | Thu May 14 16:09:49 EDT 2015 | hottchkisu
Hi All, > > On occasion we see components that > have gone through pick and place and are slightly > misaligned. Currently, operators manually adjust > these misaligned components to prevent reflow > failures. However, I am wondering if this >
Electronics Forum | Tue Jun 02 16:02:13 EDT 1998 | Earl Moon
| First of all let me say that we are currently placing other 240 pin QFP'S with no problem. But none of them have the MASS of this beast. | The part is a XILINX XC5215-6HQ240C which has a large metal heat sink covering most of the bottom of the part
Electronics Forum | Wed May 02 11:27:17 EDT 2012 | aj
Are you having problems with alignment of BGA's or perceiving that you will have problems. We run thousands and they re-align very well with leadfree if slightly off - Do you handplace all your BGA's? I would imagine there would be cosiderable cos
Electronics Forum | Fri Feb 20 13:01:26 EST 2004 | Jay
First, it depends on the alloy composition of the solder. As you might know, eutectic Sn/Pb solder has the lowest melting point among available conventional solder systems. (except those based on Sn-In and Sn-Bi systems.) For example, 63Sn/37Pb - 183
Electronics Forum | Wed Nov 13 16:48:19 EST 2013 | spoiltforchoice
I would expect any half decent machine to place 0603 parts slap bang on target to the typical defined accuracy for such parts on most machines of perhaps ~60 microns or better. Self correction during reflow is IMHO much less pronounced with lead-free
Electronics Forum | Sat Mar 28 06:45:31 EDT 2020 | aswa1111
Hey everyone, I hope all of you doing well this time of the year. We have an old Juki / Zevatech 740 pick and place machine and we got a problem with the vision alignment, every placement is off by 2mils. How can you run an offset calibration on t
Electronics Forum | Tue May 08 11:34:12 EDT 2012 | aj
why not use the placement machine to place the BGA again?
Electronics Forum | Thu Feb 05 02:34:05 EST 2009 | sachu_70
Hi Manuel, most passives are chip components. These tend to self-center/align during the reflow process. However, you need to ensure that there is a uniform balanced solder paste deposit. I had tried few such ovals in earlier stencil designs and resu
Electronics Forum | Fri Sep 16 14:51:06 EDT 2011 | isd_jwendell
I recently did a layout for a Freescale accelerometer and the mfg recommended pad layout did something similar. They where very specific in the pad layout dimensions. They stated the reason was "With the correct footprint, the packages will self-alig
