In my trainings I feel that many times people are confused about the testing and acceptability levels of bow and twist as described in the various IPC documents.
Basically for the PCB manufacturer we find the information in the IPC-A-600 and IPC-6012 documents. The assembly department should take a look in the IPC-A-610 or IPC-J-STD-001. And the proper way of measuring is described in IPC-TM-650, test method 2.4.22.
For the PCB manufacturer the process is quite straightforward, perform some measurements (length, width or diagonal size and the deviation from the flat surface), and then calculate according to the above mentioned test method 2.4.22 to find the percentage of bow or twist and finally compare this value with the criteria from one of the above mentioned documents to see if it is a matter of scrap or deliver. Read more...
Looking back at the end of each year, one tends to recall only its negative events and catastrophes. This is not our view of the world. We prefer to concentrate on the positive, following the motto "the glass is half full or half empty". Every crisis creates new, previously unseen opportunities. During their long histories, many veteran companies have frequently undergone difficult periods, only to learn from them and survive. The collective mastering of difficulties by management and employees together demands sweat and motivation. The result is often a strengthened team that is best equipped to surmount new obstacles.
Our New Year´s resolution for 2010 is focussing on our customers and together we will make the new year successful. We thank you for your cooperation in 2009 and wish you and your families a festive holiday season and a happy New Year. Together, we will do it again!
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Looking back at the end of each year, one tends to recall only its negative events and catastrophes. This is not our view of the world. We prefer to concentrate on the positive, following the motto "the glass is half full or half empty". Every crisis creates new, previously unseen opportunities. During their long histories, many veteran companies have frequently undergone difficult periods, only to learn from them and survive. The collective mastering of difficulties by management and employees together demands sweat and motivation. The result is often a strengthened team that is best equipped to surmount new obstacles. 
Cette page est en cours de construction. Le site français sera opérationnel très prochainement. En attendant, consultez nos pages en 
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