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 | Tue Mar 19 14:23:44 EST 2002 | caldon
PETE - Since you are local to ACI/EMPF you can take a run over there and speak with Greg Parks,PhD on ROSA. His phone number is 610-362-1200 x 267 or email gparks@aciusa.org. This method is much better than the "re tinning". They can actually revert
Electronics Forum | Tue Mar 26 20:16:45 EST 2002 | fastek
Let's see......I sell Japanese assembly equipment, my wife drives a Japanese car, I drive a German car, my notebook is Japanese and my camera is Japanese. Why? I appreciate quality and in my opinion, buying SMT equipment from somewhere other than Jap
Electronics Forum | Thu Mar 21 13:59:24 EST 2002 | vargas_s
We are actively looking to buy a Fuji CP6 series placement machine in the used market. We constructed a questionnaire for perspective sellers trying to get as much information out of them as we can regarding possible machines (serial numbers, dates,
Electronics Forum | Fri Mar 22 21:31:25 EST 2002 | ianchan
Hi Guys, Anyone have "comments/testimony" on having possible quality level achievements, for AQL=0.1, C=0 ??? Is this a realistic "1st Pass Yield" expectation? how about for OQC submission Lots from production? especially in a high-mix, low-volu
Electronics Forum | Fri Apr 05 08:35:30 EST 2002 | jax
When the remedy is as easy as not inserting the part until after wave........, maybe say at test, you shouldn't need more than one problem. If you think there is a problem, change it. Since we won't know as much about your process as you,( paste/flux
Electronics Forum | Tue Apr 09 00:09:25 EDT 2002 | craigj
Question. When profiling and looking at the profiles cooling rate. Over what temperature range should the slope be monitored and what sort of cooling rates should be looked for. Paste supplier says no more than 6degC per sec, some components maybe lo
Electronics Forum | Tue Apr 09 08:44:43 EDT 2002 | davef
Read IPC-7530 "Guidelines for Temperature Profiling for Mass Soldering Processes (Reflow & Wave)". There is no advantage in dropping off much faster than 4�C/sec. In fact, you risk fracturing your newly formed solder connections due to board warping
Electronics Forum | Tue Apr 09 00:26:46 EDT 2002 | craigj
Are currently investigating a change of solder paste for various reasons and are considering a move from 63/37 to using 2% silver solder paste for increased long term reliabilty of solder joints with gold finish PCBs and to further reduce reflow temp
Electronics Forum | Wed Apr 10 11:46:28 EDT 2002 | mlovett
I would like to know the Stated Specification for PTH size tolerances. Or is there a generalised acceptable limit?. We have some PCB's with hole sizes that I consider to be way off what I would deem acceptable, ie Finished hole size should be 0.89mm