Here is a link that might help explain true position, http://listserv.ipc.org/scripts/wa.exe?A2=ind0112&L=technet&P=31804 Ray Johnston Lead CAD Designer Rane Corporation 425-355-6000 rayj@rane,com ----- Original Message ----- From: "Denis Lefebvre" <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, April 25, 2006 8:17 AM Subject: [DC] Diameter True Position >I must admit, this is a drawing callout that I have never fully > understood. Back in the early days, per MIL-STD-275 I'd callout Diameter > True position at 0.010", then at some point in time it was reduced to > 0.008". Now I have someone telling me it should be 0.003". Huh? > > Can someone help me understand what this (Diameter True Position) means > and how dropping the value to 0.003" might be a good thing or a bad > thing? > > Denis Lefebvre, CID+ > Sr. PCB Designer > Finisar Corp <http://www.finisar.com/index.php> > (408) 542-3832 > > > --------------------------------------------------------------------------------- > DesignerCouncil 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 DesignerCouncil. > To temporarily stop/(restart) delivery of DesignerCouncil send: SET > DesignerCouncil NOMAIL/(MAIL) > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] or > 847-615-7100 ext.2815 > --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- DesignerCouncil 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 DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------