I have done this "half-a-hole" castellation on some .032 thick fiberglass/epoxy material, multilayer... with very small vias and a 0.8mm pitch BGA mounted to it... We built the 'chip carriers' into a panel... and the board house routed out the 1/2 a plated thru hole by drilling an extra hole tangent to the main hole and then routing them in half. There was some de-burring to do on some of them until they got the process down... There is a picture of the board on my website. Also check the FAQ area and look at the close-up view of the castellation holes. http://pcbwizards.com The shop that did the work for me is Hughes Circuits in San Marcos California. Talk with Jerry or his son Jeff Hughes and they can explain the process. Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Roderick Taylor [mailto:[log in to unmask]] Sent: Tuesday, December 07, 2004 12:20 AM To: [log in to unmask] Subject: [TN] PTH cut in half to make SMT pads Hi, Some surface mount modules that I bought are made from regular PCB material and the mounting pads seem to be plated through holes cut in half. I can't buy those modules anymore and the manufacturers have made lots of our product but without these modules. I need to make an adaptor pcb and doing it the way the orignal modules were made seems to be the easiest. They are just PTH cut in half with a nice cutting tool aren't they? Or are they a PCB with half of the PTH on the PCB and the other half falling off the side? If I went to our rapid prototyping people with this on our PCB would they understand? Do you understand what I mean? Rod. --------------------------------------------------- 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 -----------------------------------------------------