On Friday 04 September 2020 04:17:25 andy pugh wrote: > On Fri, 4 Sep 2020 at 06:18, Gene Heskett <ghesk...@shentel.net> wrote: > > Now, if I could just make it work for woodwork. > > There are quite a few designs like this around, that give you a > probeable hole for the corner and conductive replica edges: > http://www.themakersguide.com/home/products/triple-edge-finder-2
Thats cute. And any of us could make it. Just one problem. Looks like its made of alu, and alox is a perfect insulator the tool will have to punch thru in order to make that contact. Raw, freshly cut alu will oxidize to a thick enough coat of alox than can be punched thru by 5 volts in milliseconds after the machining tool cutting edge has passed. Surface damage will be done by the time ohmic contact is established to both the jig and to the tool being used for contact. So I wonder what he is making it out of in order to assure long time use. Steel, if allowed to rust would suffer the same effects over a much longer period of time as rust isn't a very good conductor either. Copper would work far longer than alu. It registers contact before any damage mark is made, but that obviously isn't copper, so what it it? Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
