Electronics Forum | Sun Aug 17 19:06:42 EDT 2014 | natashakt
Hi All, I have been looking in to some failures of PCB's in Assembly. After SMT the boards are stored for different periods of time in high humity environment (72% RH and 21.4 degrees Celsius) before being sent to Assembly to be handsoldered/put thr
Electronics Forum | Fri May 03 00:36:36 EDT 2002 | caldon
Not many tech stocks not plunging. Pete is correct.......You application should determine the machine not the machine determine the application. That is why there are machines from $15K(US) to +$400K. Mechanical, Laser, vision.......servo, linear...
Electronics Forum | Mon Dec 14 15:08:46 EST 1998 | Jim Mitchell
Provided your software supports board stretch and the board is stretched in a linear fashion, you should not need fiducials for each image. If you do elect to use local fiducials, Quad recommends a single fiducial. This method is faster and you can
Electronics Forum | Wed Dec 10 14:37:47 EST 1997 | Frank Murch
There is a direct relationship between adhesive strength and surface area. If you graph this it will be linear. The amount of the adhesive should be about 2/3 the gap between the pads. Pad designs change all over so a true and tried rule does not ex
Electronics Forum | Thu Nov 07 12:07:46 EST 2002 | slthomas
This is more of a two-dimensional phenomenon than the linear features (wrinkles) that I would associate with disturbed solder. What I should do is contact my own solder supplier on this, I guess, but it hasn't been particularly high on my priority l
Electronics Forum | Mon Jan 26 21:10:36 EST 2004 | Vinny
I have done acurate profiling which meets the solder paste specifications. The point I am trying to highlight here is also due to the ground plane side being much larger causing the tombstone defect. I have even tried doing a linear profile, it hel
Electronics Forum | Mon Oct 04 20:04:53 EDT 2004 | davef
Sounds like a perfect application of a linear program. This is a chance for an OR-guru to shine with a real-world application, rather than something dopey, like determining the most profitable mix of products to create from a piece of timber. The L
Electronics Forum | Fri Jul 22 16:42:50 EDT 2005 | campos
hello all, I�m experiencing problems with "warped" boards after first reflow, some of them i just can�t print side two due to this problem,,is it related only to reflow? i�m using a linear profile (225� peak / 70s time above) with a tin lead paste,t
Electronics Forum | Mon Oct 10 22:56:13 EDT 2005 | Alan.
Dave, it could be that you have some dirt or grease on the linear scale for the X-axis. Try getting into the rubber shield with a soft brush or perhaps a spray. Threebond Super Cleaner 6602 is very good for this purpose as it cleans and dries w
Electronics Forum | Fri Jan 20 08:55:31 EST 2006 | patrickbruneel
Steve, How do you measure the resistance is it by probing the surface? Concerning the alloy there is a straightforward linear correlation between the tin content and the electrical conductivity of the alloy. The higher the tin content in the alloy,
