Peter, I am not sure of the IPC specification for this, perhaps IPC-276 (old numbering format) But our PWB specification we send to any vendor fabricating rigid boards for us states; Conductor Width Reduction Conductor shall not be reduced by more than 20% from undisturbed width at any location due to edge roughness, nicks, pinholes, scratches, voids, and mouse bits. Conductor Thickness Reduction Conductor thickness shall not be reduced by more than 20% from undisturbed thickness at any location due to nicks, pinholes, scratches, and depressions. Under Cut allowance is defined as 3/1 ratio of conductor height and shall not be exceeded. We inspect to this a reject all product not meeting these specifications. We build Class 2 PWAs and do not encounter much argument from our fab houses. hope this helps Greg Scott Cray Inc Seattle, Wa. Bill Butman wrote: > Hello Peter, > > If you do decide to repair the traces, look at > IPC-7721, procedures: 4.1.1 thru 4.2.5. These IPC > approved procedures describe several methods of > performing reliable repairs to damaged traces. > > In addition, web site www.circuittechctr.com has > information on trace repair, in their "guides" > section. > > If I can be of more help, please let me know. > > thanx > > Bill > [log in to unmask] > --- peter lee <[log in to unmask]> wrote: > > Does anyone know if there is a min. acceptance > > standard for the copper conductors on PCB, > > specifically on the traces width? > > > > I am encountering partially broken traces on a board > > and thinking at which point should I start looking > > at > > the option of repairing. > > > > Rgds, > > Peter > > > > > > __________________________________________________ > > Do You Yahoo!? > > Make international calls for as low as $.04/minute > > with Yahoo! Messenger > > http://phonecard.yahoo.com/ > > > > > --------------------------------------------------------------------------------- > > Technet Mail List provided as a free service by IPC > > using LISTSERV 1.8d > > To unsubscribe, send a message to [log in to unmask] > > with following text in > > the BODY (NOT the subject field): SIGNOFF Technet > > To temporarily halt delivery of Technet send the > > following message: SET Technet NOMAIL > > Search previous postings at: www.ipc.org > On-Line > > Resources & Databases > E-mail Archives > > Please visit IPC web site > > (http://www.ipc.org/html/forum.htm) for additional > > information, or contact Keach Sasamori at > > [log in to unmask] or 847-509-9700 ext.5315 > > > --------------------------------------------------------------------------------- > > ===== > Bill Butman > Circuit Technology Center > 45 Research Drive > Haverhill, MA 01832 > > __________________________________________________ > Do You Yahoo!? > Make international calls for as low as $.04/minute with Yahoo! Messenger > http://phonecard.yahoo.com/ > > --------------------------------------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ---------------------------------------------------------------------------------