David, Typical note we use for manufacturability reasons is .06 Min Radius on all inside corners... However... that does not mean that someone can't make a sharp corner for you... it just means we save money on our boards by not designing in sharp inside corners... In the old days we used a corner notcher shear to do sharp corners.. there are also NC nibblers out there that are used for sheet metal that could punch out a sharp inside corner... but I have not tried that for various reasons... best way to deal with it is not to design them in... Perhaps you relieve the corner with a drilled hole in the exact corner and then route up to it with a standard .125 inch dia router bit... allowing it to not actually contact the pin point corner of whatever you are mating with it? Why do you need a sharp inside corner? Bill -----Original Message----- From: David Baldwin [mailto:[log in to unmask]] Sent: Thursday, August 02, 2007 3:46 PM To: [log in to unmask] Subject: [DC] Typical Routing Bit Size - Critical Corner DC Members: I am designing a board that has a critical inside corner. Can anyone tell me what the typical minimum routing bit that a board shop uses? I need a perfect corner so I believe we will need to overshoot the routing to eliminate the radius, but I need to keep it at a minimum. Thanks in advance for your input. David Baldwin C.I.D.+ ---------------------------------------------------------------------------- ----- 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 ---------------------------------------------------------------------------------