Couldn't agree more. From a PWB manufacturer's point of view that is. Some suppliers may indeed be able to do a little better than the 0.010" to 0.012", depends on the various process capabilities that determine their ability to register the pad to the hole. Bob Dube -----Original Message----- From: Joe Uhr <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Thursday, February 03, 2000 2:43 PM Subject: Re: [TN] VIA pads >Yvon, > >.010"-.012" over drill size is pushing the limit. .018" via (finished hole >size, plated, I am assuming) would probably be drilled with a .024" drill >bit, assuming a +/- .003" tolerance on finished hole size. .034" would then >be the pad size. The PWB supplier would definitley let you know if that was >a problem. That is why it is a good idea to involve suppliers in DFM >reviews. > >JU > > >-----Original Message----- >From: Yvon Hache [mailto:[log in to unmask]] >Sent: Wednesday, February 02, 2000 8:06 AM >To: [log in to unmask] >Subject: [TN] VIA pads > > >Good morning everyones around the World, > >I have a design/manufacturing question. If we use a 0,018" VIA, what is the >smallest pad size we can use on this VIA without causing problem in PCB >manufacturing? > >thanks > > >Yvon Hache, P.Eng. >Tel: 506-863-2467 >Email: [log in to unmask] > >Concept + Inc. >Scientific Park, Suite 100 >55 Crowley Farm Rd, >Moncton, NB >E1A 7R1 > >Tel: 506-858-4153 >Fax: 506-858-4075 >Web: www.concept-plus.com > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following >text in >the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional >information. >If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or >847-509-9700 ext.5365 >############################################################## > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in >the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional >information. >If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or >847-509-9700 ext.5365 >############################################################## > ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################