Hi Jeffery, Your picture are up! Here they are: http://stevezeva.homestead.com/files/break_away_1.JPG http://stevezeva.homestead.com/files/break_away_2.JPG Nice break-away Jeffery... -Steve Gregory- ----- Original Message ----- From: "Jeffrey Bush" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, January 24, 2007 3:11 PM Subject: Re: [TN] Question about cracker holes (panel breakaways) Here is a good case where the board is thick and the conductors are close to the edge. I suggest ensuring the rout breaks the first and last web hole leaving only the material between the holes for retention. The hole also appears to be spaced more than I would recommend to give a good break out. I sent pictures to Steve on a .140" thick RO4003/FR4 mix that uses a .025" hole on .035" centers to obtain this break out. You can see the good affect Eddie recommended by placing the holes inside the PCB. These are placed so only .005" of the hole profile breaks the external PCB edge. The residual is slight and only a few have any nubs violating the board interface dimensions. Jeffrey Bush Director, Quality Assurance and Technical Support VERMONT CIRCUITS INCORPORATED 76 Technology Drive - POB 1890 Brattleboro, Vermont 05302 Voice - 802.257.4571 ext 37 Fax - 802.257.0011 <http://www.vtcircuits.com/> -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Wednesday, January 24, 2007 12:34 PM To: [log in to unmask] Subject: Re: [TN] Question about cracker holes (panel breakaways) Done! http://stevezeva.homestead.com/files/cracker-hole.jpg Yeah, I might clean these up a bit. But the mousebite (that's what I call them) pattern could be done better... -Steve Gregory- -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon Sent: Wednesday, January 24, 2007 11:26 AM To: [log in to unmask] Subject: Re: [TN] Question about cracker holes (panel breakaways) Joel: Can you send a picture of the board design to Steve? He may post it for everybody to see excatly the design of the board with the mouse bites. Regards, Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Eddie Rocha Sent: Wednesday, January 24, 2007 11:50 AM To: [log in to unmask] Subject: Re: [TN] Question about cracker holes (panel breakaways) The cracker holes should be designed so that the nubs (left after breaking) do not protrude beyond the PCB dimensions. This means that there will fall inside the board and leave a mousebite which can be about .010 inch, if designed properly. Hope this helps. -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Joel Alexander Sent: Wednesday, January 24, 2007 7:04 AM To: [log in to unmask] Subject: [TN] Question about cracker holes (panel breakaways) We have been using panels with internal breakaways for over 20 years. There is a slight amount of material left when they are broken but we have never had a customer complaint about this. We have started doing military business and they are rejecting everything because the cracker hole areas exceed print dimensions. It is obvious that the additional material at the cracker hole location does not have any impact to the end use. Is there any industry standard that would permit the use of cracker holes Also has anyone had similar experiences dealing with military customers and if so what was the end result? Joel Alexander Quality Assurance Manager --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------