There are a few sites out there. Here are a few I've come across: http://www.uniontool.co.jp/english/tech_01.html http://www.megatool.com/ http://www.kyoceratycom.com/ http://www.discount-tools.com/technical.htm http://www.tulon.com/ It would be difficult to go into detail about the different drill parameters, backup & entry materials, different material / resin systems, drill machines, drill bits, etc... The best way to deal with this is to design a DOE using your equipment, drills, materials, and evaluate the effects of different infeeds, spindle speeds, hit counts, etc... By sectioning and measuring the aspects of the drilled hole wall quality - smear, gouging, nailheading, burring, just to name a few. Hope this is of some help. Dave Simonik Sanmina-SCI Corp. -----Original Message----- From: Parial Swati [mailto:[log in to unmask]] Sent: Friday, January 23, 2004 2:59 AM To: [log in to unmask] Subject: Drill Bit Geometry Defects Dear Technetters, Is there any document or web site which has information about the different drill bit geometry defects and their effects on drilling quality expalined in detail. It will be even more helpful if any one can tell me the effect of different drilling parameters and their effect on drilling quality in detail. Warm regards, Swati Scan by AT&S virus protection --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 847-509-9700 ext.5315 -----------------------------------------------------