Electronics Forum | Thu Mar 12 06:37:48 EDT 2009 | gregoryyork
I agree you are too cold for the profile get it up to 230C and possibly allow it to dwell a little longer in preheat as opposed to pushing up the reflow zone only. Sn90/Pb10 melts at 220C so 2C hotter than your profile so you are reliant on it alloyi
Electronics Forum | Thu Oct 30 22:29:58 EDT 2008 | davef
For most applications, a nice square [or rectangle] pad works just fine. Assemblers ship boat loads of boards with these every day. It's reasonable for tight decoupling capacitor requirement applications to use round or radiused pads for components
Electronics Forum | Fri Mar 06 10:46:35 EST 2009 | davef
First, we agree with Loco that your QFP is nonwetting, rather than dewetting. Your sceen-shots look like ol' timey SnPb paste recipes. Turn-up the heaterometer dial. Second, on nitrogen: * We kinda think your O2 needs to be around 100ppm with 99.99%
Electronics Forum | Mon Jul 12 21:05:06 EDT 1999 | karlin
Hi, I need some urgent informations on stencil design guidelines on how to perform epoxy printing on 0603 and 0402 components. Could anyone help? ( Reflow process is not possible because of some other constriants) Secondly, I need also facing a lo
Electronics Forum | Thu May 05 07:58:35 EDT 2016 | cyber_wolf
Not sure what you mean. 0201's and 0402's are both on 8mm feeders. Juki's will do simultaneous picks an all 8mm feeders no matter the component size. Your feeders need to be maintenanced and calibrated to reliably pick 0402's and 0201's. I hav
Electronics Forum | Thu May 05 01:50:44 EDT 2016 | darby
Dear Forumites, It's been a while, but I have a question. I was recently asked to provide a scenario on capacity if we retired two older lines and replaced with a new line. My capacity figures were based on real time production over a period of six
Electronics Forum | Fri May 06 07:58:33 EDT 2016 | cyber_wolf
Darby, I'm not completely sure I understand. Juki machines have what is referred to as a multi-head. The offsets between the heads are the same as the spacing between 8mm feeders. So the (6) heads all come down at once and "gang pick" from 6 8mm fee
Electronics Forum | Thu May 19 02:04:36 EDT 2016 | jpcwg
Located in Shenzhen China, the Silicon Valley of hardware, ALLPCB.com is a company specialized and experienced in manufacturing printed circuit boards of prototyping and low volume production. Through the years thousands of business customers and eve
Electronics Forum | Thu May 05 19:13:33 EDT 2016 | darby
Thanks Sr. If you have zero tolerance for simul pick up in your component files then you will not have simul pick up due to variances in your head offsets. So you are saying that on your Juki you run a tolerance for 0201? All other head positions at
Electronics Forum | Fri May 06 08:27:38 EDT 2016 | kahrpr
We have Samsung and havehad no problems with simultaneous pick ups with 201s 0r 402s. the feeders are durable and do not need much repair especially the sm feeders. The SME feeders have not been out as long so we will see so far so good. As with all
