> -----Original Message----- > From: piclist-bounces@mit.edu On Behalf Of peiserma@ridgid.com > Sent: Thursday, January 18, 2007 5:04 PM > > Note how the via is specified becomes important. Do you give the mfg. > an inner diameter and let them pick the drill, or do you give them > actual drill sizes? The many PCB manufacturers I've used over the past 25 years vary greatly in plating thickness. So I always provide the finished hole size and let the PCB guys figure out what size hole to drill before plating. This has the added benefit of not having to change the design files every time the plating process gets improved or the vendor is changed. I put a note on the drill drawing that states the sizes are "finished hole sizes (after plating)". If I was designing a PCB where current carrying capacity was important, I would also add a note to the drill drawing on minimum plating thickness requirements and then also put a note in the readme file. Paul -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist