Electronics Forum | Thu Jul 27 08:03:18 EDT 2006 | Chunks
Hi H.K.H. OK, I'll step on this one to see what happens... What exactly is the defect? You state this SMT spring acts as a conductor between an R and C. You also state it acts as a housing shock absorber too? Just trying to understand your quest
Electronics Forum | Thu Jul 27 00:40:34 EDT 2006 | Habibooboola K. Halaliliaholiokeebob
I have a production defects on smt mounted spring that the designre at my compnay is try.the spring act as conduction between the resistor capacitor network and mount with the prefrom and then reflow thru the oven. the design intent for spring is mec
Electronics Forum | Wed Jun 07 09:06:06 EDT 2000 | Stefan Witte
Compared to paper tape, I find a higher defect rate on 0402 components in plastic tape even without the PSA tape. The plastic tape appears to be less shock absorbent and this may be the reason for feeding problems on small components. PSA tape has it
Electronics Forum | Sat Sep 21 11:53:01 EDT 2002 | reg
Hi. Can anyone point me in the direction of a company (preferably in the UK. Scotland would be even better) I could buy mats from. I'm looking for 700mm square mats for transporting a mech assy between stages down a roller converyor. I've used ones b
Electronics Forum | Thu Dec 07 03:21:54 EST 2006 | Guest
Materials you see are corner bond adhesive, main purpose of this is mechanical shock absorber , it promotes additional adhession to lessen stress to solder joints incase device subjected to mechanical stress like dropping.By function, corner bond
Electronics Forum | Fri Nov 05 21:41:46 EST 1999 | chartrain
Temperature vs time is what soldering is all about. The faster you run your conveyor, the more heat will have to come from the pot for a given assembly. Example: You heat the board to 200F top side through the preheaters. Eutectic 63/37 melts at 361.
Electronics Forum | Thu Dec 04 09:49:11 EST 2008 | lazzara55
Dear Steven: Often the recommendations for baking prior to assembly are derived from various J-stds. But J's currently concern baking moisture out of components, and fail to address the moisture issues of the PCB. Because of that, there is the IPC D
Electronics Forum | Thu Sep 03 14:09:22 EDT 1998 | Matthew Park
Rich, From my experience, few causes of capacitor cracking are: - mechanical stress caused by pick'n place nozzles and chucks. Try to isolate and find cracked caps before boards go thru reflow or wavsoldering. - thermal stress by reflow pro
Electronics Forum | Wed Nov 07 17:11:14 EST 2001 | davef
1 CAN WAVE SOLDER AFFECT OR DAMAGE BGA? Sure. Since you are vague, assuming: * Partially assembled board was not stored to prevent moisture absorption. * BGA is in a plastic package. * Partially assembled board was stored long enough to exceed th
Electronics Forum | Thu Dec 22 21:29:05 EST 2005 | davef
Josh: Room Temperature Vulcanizing (RTV) is Dow Corning's trade name for it's family of silicone cure sealants. RTV is about the worst kind of coating there is. Its chemistry is highly ionic and it requires atmospheric humidity absorbed to "complete
