Electronics Forum | Mon Jan 20 17:42:45 EST 2003 | jonfox
Double check the data sheets for your paste. Just as an example, ou Indium paste has a recommendation for the Heating, Liquidus, and Cooling stagees of reflow. They recommend a linear ramp up of 0.5 to 1.0 degree C. In the Liquidus stage, a peak t
Electronics Forum | Fri May 10 05:01:39 EDT 2002 | cmay
Morning guys, I would just like to find out which type of control charts / SPC type methods (if any) that people are using for SM and flow soldering. I am setting up process controls for our 3 flow solder machines at my new company and would just l
Electronics Forum | Thu May 31 02:48:49 EDT 2012 | leeg
Does anyone use an excel spreadsheet to monitor and show via a control chart their paste height check data and if so would they have a copy that I could use as a template? We have a spreadsheet that we use but print it off and fill the data in, I am
Electronics Forum | Fri May 10 17:50:25 EDT 2002 | davef
We chart the following: * Reflow: Time over liquidous +25�C * Wave: Contact time and track tin, copper, gold, and antimony in pot analysis.
Electronics Forum | Sun Aug 02 10:29:28 EDT 2009 | Sean
Hi all, If we are using non clean flux, what are the wave soldering parameters that we should monitor using SPC control chart? If not mistaken pre-heat is one of the important parameter that we should control.. Thanks, Sean
Electronics Forum | Thu Apr 03 09:27:04 EST 2003 | davef
First, welcome to SMTnet. On your question, are you talking about control charts? If so, here's some background on control charts http://deming.eng.clemson.edu/pub/tutorials/qctools/ccmain1.htm What are you plotting: * Independant variables? * De
Electronics Forum | Fri Jul 15 03:29:52 EDT 2005 | dougs
thomas, why isn't it process control, you cant just think that because you've set up your machine properly ( pot temp, wave height, pre-heat etc etc )that everything is going to be ok, there are other factors that you wont find with wave riders or
Electronics Forum | Tue Mar 04 15:46:00 EST 2003 | EW
I'm not sure to what degree you are manually crunching this data.....If you can set up the data manually, or parse the data from a recording function, to allow it to import into a database with a formula for Cpk, and everything else you could ever in
Electronics Forum | Fri Sep 06 11:58:21 EDT 2002 | Brian W.
The most effective method is to monitor both printing results and parameters. Periodically (maybe once per month), run QCCalc or another program to measure the machine's capability to hold its set parameters. I also run control charts on the paste h
Electronics Forum | Wed Dec 13 20:46:46 EST 2000 | Dave F
I�ll bite ... Why can�t you calculate LSL/USL values from your control charts? We find that LSL/USL values generally are unknown. If you are seeking a text on statistical analysis consider: "Statistical Process Control for Surface Mount Technology"
