Electronics Forum | Wed Aug 15 19:04:26 EDT 2001 | mparker
Viewing a blade on its own merits may give you subjective results. Are you asking about metal or rubber squeegees? You really need to examine the print quality before you decide if a blade is worth using. If you are getting the right paste deposit vo
Electronics Forum | Fri Aug 17 12:07:40 EDT 2001 | davef
We always get pissed-off a preform suppliers when they tell us that we need to do NRE to develop a preform. Is that BS er watt? Ya got this vanilla connector that everyone on the planet uses and we have to pay NRE. It's just a scam. Try Teka Inte
Electronics Forum | Thu Aug 23 15:45:48 EDT 2001 | slthomas
So, we've already addressed the tombstoning on these guys by adopting the mfr's (Pana.) recommendations for pad size and spacing. Problem is, we have pretty bad wetting of some of these parts. The rest of the board we use them on looks great, nice
Electronics Forum | Wed Nov 28 09:17:17 EST 2001 | Dave G
I've heard of reliabilty problems caused by wave soldering melf's as well. We don't put Melfs on the bottom of our PCB's on newer designs. We only have to deal with gluing & putting them through the wave on some of our older legacy designs. Increasi
Electronics Forum | Mon Sep 03 16:51:58 EDT 2001 | edmentzer
We have stored PCB's in the refrigerator twice when our old pick and place died during production. One time the boards were in the frig for two days. I put the boards in a tray and covered the tray with plastic food wrap. We waited about two hours
Electronics Forum | Mon Sep 10 19:47:23 EDT 2001 | djarvis
We recently trialled a range of different solder pastes. Some just did not have the "green strength" to hold the components when placed by the higher speed machines. I'd never seen this before and spent a day and a half checking all the things everyo
Electronics Forum | Mon Sep 10 17:07:23 EDT 2001 | Dave G
I've mounted the $%&R$#$&%$(&! pain in the neck shield clips in the past. (Excuse the simulated profanity- I couldn't help myself.) What we went to was a frame & shield combination. (The frames are cast & then plated w/tin. We have used both plastic
Electronics Forum | Thu Sep 13 17:57:59 EDT 2001 | davef
You're correct. It is curious. Possible angles to look at are: 1 WS609 loves moisture in the air. In high humidity shops, this paste hakes-on liquid. If this is the case, you should also see slumping, resulting in fine pitch bridging, and solder
Electronics Forum | Fri Sep 28 09:30:07 EDT 2001 | kmorris
Just had a similar phenomenon 2 days ago. May relate to your issue --- or not. Like you, I did a once over looking for mechanical obstruction & couldn't find any. Ran a thermal profile on the offending PCB & all checked out. Looked in end of oven
Electronics Forum | Mon Sep 17 16:03:13 EDT 2001 | jschake
The results from an experiment comparing 27 different combinations of pad dimensions concluded that the pad design with 15 mil pad length, 12 mil pad width, and 9 mil pad separation produced the best assembly yields. A 5 mil thick laser cut stencil
