Electronics Forum | Fri Jun 22 11:09:01 EDT 2007 | realchunks
Sup G! Normally when spray fluxers get neglected, the spray pattern is the first thing affected. To actually 'see' this, we cut out a piece of cardboard the same size and length of the board. Run it over the fluxer and then turn itover and look at
Electronics Forum | Tue Jun 26 11:24:56 EDT 2007 | ck_the_flip
Patrick, Back in my rich OEM days, i actually DID measure mg/in^2. I bought a scale, which measured in mg, specifically for this. Basically, took a blank PCB, took a "before" weight, sprayed it, and then took an "after" weight. I measured at diffe
Electronics Forum | Fri Jan 16 08:36:40 EST 2009 | davef
That the bubbling gets worse when you run the board through the oven indicates the issue is with the balance between releasing volatiles and cure. Try one of these ideas: * Adjust the atomization pressure, nozzle size, temperature or viscosity of th
Electronics Forum | Wed Sep 01 12:58:42 EDT 2010 | scottp
A good paste will print fine up to 5 in/sec or so. They key, as mentioned, is to get the pressure right for a given squeegee speed. If the squeegees aren't giving a clean wipe then you'll see huge variation in print volume which can lead to shortin
Electronics Forum | Wed Mar 27 16:03:01 EDT 2019 | jdengler
Jim, It's been a long time since I worked on one of these so this is going to be a general idea as to the issue. There's a solenoid valve that is controlled by the E-stop ckt. When in E-stop in stops air from entering and vents the pressure lines
Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef
Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c
Electronics Forum | Fri Feb 20 14:16:06 EST 1998 | Dave McFadyen
I've been using metal blades on several brands of printers over the past few years and have to agree with comments in other replies. Contact print is a must or you will tear slits in your stencils at the ends of the blade. Center-mounted (floating) s
Electronics Forum | Thu Mar 20 13:22:27 EST 2003 | bmaheu
James, I've done some extensive studies cleaning BGA's while I was employeed by one the companies you are considering. In an attempt to avoid being commercial I will use general statments to address your question(s). The key to cleaning underneath
Electronics Forum | Tue Jan 09 13:54:10 EST 2007 | jdengler
Hi All, I'm having a problem with a Fuji GP-341. It has squeegee pressure control using a TEAC TD-320A comparator. I cannot get it to measure printing pressure. On the TD-320A it normally reads "2512" then flips to "oFl4" then back to "2512". If
Electronics Forum | Tue Sep 20 11:59:06 EDT 2011 | SheanDalton
Check specific gravity: According to a quick web search, the specific gravity should be 0.813 ± 0.003. If you have records of the specific gravity, compare current reading to past readings. Check pressure near stone: if you have records, compare
.gif)
winsouce.jpg)