Electronics Forum | Mon Nov 25 12:57:29 EST 2002 | caldon
Maxtim- I have used APE's Sniper, airvac, Mecal's 3500, PDR, Pace, and MArtin's rework stations. APE Sniper does the Job but to much automation and not user friendly software. PDR is to much IR and no convection. Metcal's work good now with the ne
Electronics Forum | Mon Nov 25 20:24:13 EST 2002 | bcceng
Maxtim, Again I have implemented BGA rework in four CM's and the machine that I have selected is the Conceptronics. In contract manufacturing you will have to be prepare to rework from the smallest to the largest boards with lots of ground planes. Co
Electronics Forum | Sat Nov 23 10:19:39 EST 2002 | davef
This sounds alot like the warping that we all see periodically in BGA. CTE of material is temperature dependent and not temperature changing rate dependent, so you are pretty much hosed by the physics. Regardless, I do like trying like crazy to g
Electronics Forum | Mon Nov 25 12:32:20 EST 2002 | davef
Now that is a BIG step. Stencil type: * A metal squeegee is fine with stepped stencils. * A rubber squeegee is fine with stepped stencils. Comments on step stencil "keepouts" are: * Use an ample space around the stepped down component pads that is
Electronics Forum | Thu Jan 02 15:32:26 EST 2003 | Mark
Hello. Sometimes metal squeegees DO work with stepped stencils. You will always get much better results with metal squeegees compared to polymer blades. The only requirement for the metal squeegee to work, you need about 0.06 in clearance for eve
Electronics Forum | Mon Nov 25 16:12:52 EST 2002 | russ
there is a good article by AIM solder regarding tin. In a nut shell, if you do not apply flux or heat to tin finish you will never degrade it! I agree with the others that you need to check the thickness of the pure tin layer. We have forbidden ti
Electronics Forum | Tue Dec 03 12:31:34 EST 2002 | ianlg
Hi Brad If you looking for an excellant new product check out Reprint Services ( http://www.reprintservices.co.uk ) Their R29 Screen printer is selling well in the UK and Europe and has just been launched into the far east. Due to launch this into t
Electronics Forum | Sun Dec 01 00:28:41 EST 2002 | yngwie
What is the danger of using the expired glue or Loctite ? I'm using Loctite 383 and the expiry date was Oct 20th. I refused to use them, and my refusal has caused the downtime incured for 8 hours. Felt guilty, as I knew this glue can still be functio
Electronics Forum | Mon Dec 02 13:55:49 EST 2002 | stepheno
Where I worked we used a different chip bonder. When we had trouble with flux entrapment in the epoxy from the wave solder, we checked the date of the epoxy. The tube didn't have one but the manufacturer gave a shelf life of 6 months and then the s
Electronics Forum | Mon Dec 02 15:56:40 EST 2002 | russ
For CYA reasons you made the right choice (I agree with Mark). But, for whatever it is worth I have used Loctite 383 up to 4 years past it's shelf life It worked fine for my application (wire tacking, FR4 bonding etc...). Have you ever seen a shelf
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