Electronics Forum | Thu Mar 14 09:07:26 EST 2002 | cfraser
I can not tell you what the actual stress limits are. I can tell you that de-paneling PCB's by hand is a very poor choice. I have seen numerous accounts of cracked caps, resistors, and LED�s due to incorrect de-paneling procedures. I would recommend
Electronics Forum | Thu Mar 14 17:10:22 EST 2002 | stepheno
I've been looking at buying a trace repair kit. The one I'm looking at includes some nifty little bits for a dremel or whatever. What I was wondering is, if someone is going to cut traces with a dremel, would you reccommend getting the stand for it
Electronics Forum | Sat Mar 16 18:06:31 EST 2002 | davef
First, you're correct. Trace repair and rework is not for the faint of heart or novices. Second, our "girls" prefer a dental drill type tool [Dremel Flexshaft], rather than the clumsy Dremel type from Wal-Mart. They also like a vice with a unversa
Electronics Forum | Mon Mar 18 11:04:39 EST 2002 | slthomas
At a previous employer we used a pneumatic dental type drill with nice results. The 1/4" hose is much more flexible than a flex drive cable, there's no motor module on the work surface, and the foot pedal for the air a little more elegant than two-h
Electronics Forum | Mon Mar 18 09:10:17 EST 2002 | davef
We use an internally developed database. Check Quality Magazine http://www.qualitymag.com for supplier conracts. We looked at: * novasoft 617.221.0300 * PQ systems 800.777.3020 (Workbench $1k) * Quality Management Products 888.255.1992 Mike Haines
Electronics Forum | Tue Mar 19 00:14:47 EST 2002 | ianchan
Hi Guys, Can anyone help us out here, please? We need to know what formulae (other than Length(L)xBreath(B)xheight(Z)), is used to determine what volume of paste is required for 20mils pitch leadless chip carrier (LCC28), for the paste printing pro
Electronics Forum | Wed Mar 20 00:55:01 EST 2002 | ianchan
Heyz...at this rate i'am losing my mind too! We have been doing the "looks good; look bad" approach, and backed it all up with Z-height paste measurements. Only thing there's this customer QA asking how we established those USL & LSL utilized in our
Electronics Forum | Wed Mar 20 19:53:11 EST 2002 | davef
Your customer's question is reasonable. Before you can establish your control limits, you need to take 25 to 30 data samples of 4 to 5 measurements. This says you need a 100 or more measurements before you can start charting. And even this much
Electronics Forum | Sun Mar 31 23:11:41 EST 2002 | ianchan
thanks, everyone for your valuable feedback and shared opinions. Appreciate your efforts! been following up with this "nitwit" issue on volume calculations (sortof a forumulae to confirm a formulae???) for paste printing process. What we did was to
Electronics Forum | Thu Apr 18 17:17:20 EDT 2002 | Eric Wolf
I have found a consistency in certain package types which hold a very close tolerance. We use a six mil laser with electropolish. BGA's are tight. Some IC's drift. I think the range and Cp is more important than the Cpk for today. The reason bei