Electronics Forum | Thu Jun 03 01:26:06 EDT 2021 | deanm
This may seem off the wall but I've seen it work in the past. It is a visual management system without the need for barcodes or spreadsheets. Obtain quantities of different colored clothespins. When a reel is taken out of inventory, attach a colored
Electronics Forum | Thu Jul 10 08:18:15 EDT 2014 | emeto
I think what you are asking for is called First Pass Yield and for us that is in the upper 90s. It will depend on the board complexity and quantity - makes big difference if you run 10pcs or a 10000pcs. Regards, Emil
Electronics Forum | Tue Aug 28 12:05:42 EDT 2001 | mparker
The advantage of DPMO is that the numbers used are PPM, (Part Per Million), rather than percentage. Percentage can distort, depending on volume. For instance, 100 units processed, 25 defects found = 75 percent yield. 4 units processed, 1 defect found
Electronics Forum | Wed Nov 23 19:50:23 EST 2016 | gmscribe
Hi guys, I'm working on a design involving a 223-pin BGA with 0.5mm pitch (ball size 0.3mm) with a 16-bit DDR3 controller involved. Currently routing a track between two balls is resulting in a track width of 0.1mm and a spacing of 0.077mm. Now the
Electronics Forum | Mon May 28 04:29:16 EDT 2001 | hello
we met the same problem with audit, and i make a tooling log for each stencil and in tooling log , set up some criteria for checking such as tension , mechanical damage, printing result ect. The stencil will be checked periodicly by process engineer,
Electronics Forum | Tue Jul 27 11:16:40 EDT 2004 | carterhoward
Hello , I agree with the solder ball theory, we used to have an issue with high humidity and it produced the results you�re describing. Our solution to this since adding dehumidifiers was too costly was to increase the quantity of intake ducts for t
Electronics Forum | Thu Aug 02 09:56:57 EDT 2012 | mccabekev
We currently operate a procedure of keeping fresh tubes of solder paste in a fridge. When it is required we remove the required quantity from the tube and return the tube to the fridge before it warms up to room temperature. We then store this at r
Electronics Forum | Thu May 26 10:37:47 EDT 2005 | stepheniii
How are you counting parts back into stock? If it is an estimation then that could be your problem. One place I worked, the stockroom estimates were usually double what the lead hand would estimate. If you are using a counter then your rate is probab
Electronics Forum | Fri Nov 21 13:37:36 EST 2014 | gregp
If there are parts "non-identifiable" then you don't know their cost. Parts under a certain cost you don't worry about. That leaves only category "A" parts to concern yourself with. Know your attrition rates especially for parts over a certain cos
Electronics Forum | Tue Aug 28 12:25:26 EDT 2001 | Steve
To be honest with you, it doesn't really matter how you present the data, as long as you understand what the problems are. Bottom line is who cares what the numbers are unless you are doing something about it. Are you able to track the individual de
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