Interesting question. I know that we and our military customers typically would reject a microsection showing .0018 annular ring. However, after reviewing IPC-6011 para 1.3.1, "Acceptability when limiting values are specified" says, "an observed value shall be rounded of to the nearest [0.1 inch, 0.01 inch or 0.001 inch] and compared to the limiting value. If the specification calls out .002 mil annular ring, and a microsection reads .0018, it would be rounded to .002 and it appears that it would be acceptable and specification compliant. If the specification called out .0020 minimum annular ring,(it dosn't) then a reading of .0018 would be rejectable based upon the four decimal places in the callout. It depends upon the number of decimal places in the specification callout. IPC-RB-276 also clarified this point in para 1.4.2. It is basically the same verbage aws IPC-6011 So, my take is that by the specs, .0018 would be acceptable. However, I think I would still have a battle with several customer on this issue. Adios' Jim At 01:42 PM 9/30/97 -0600, you wrote: >I have an ongoing arguement with someone. If there is .0018" of annular >ring, are you allowed to "round-up" to .002"? This is based on the fact >that the measuring device resolves to four decimal places but the spec. only >gives three. > >I think a minimum is just that, nothing below is acceptable. Your >thoughts.......... > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >############################################################## > > ===================================================== Jim McNeal Q.A.and Eng. Mgr. Electro Plate Circuitry, Inc. Carrollton, Tx Ph. 214-466-0818 EMAIL [log in to unmask] ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################