On Thursday 03 August 2017 13:18:49 Chris Albertson wrote: > Of course diamond will dissolve in even stone cold steel. But at what > rate? I remember a chemistry teacher explaining have the walls of a > glass beaker would dissolve in water. So we set about to figure out > how long until a glass of water would eat a hole in the glass and > leak. It was a good exercise in scientific notation, it would take > a LONG time. > And you would have to replenish the water lost from evaporation. I'd expect there would be a possibility of getting the same water molecule out of the faucet at some point but doubt it would be the same faucet since both water and time would be heavily into scientific notation by then.
> But the diamond problem run faster then you think because the local > pressure and temperature at some local microscopic place is HUGE. > Even if the average temperer of the steel is only "warm" What > meters is the pressure and temperer of the few atoms that are actually > in contact not the bulk temperer of the materials. Nevertheless guys, I did pay $12 for the disk so I could use it exactly so. In case no one has noticed, a tool grinder ready to actually be used is nominally 150x that $12, since its around $750 before you buy the toolholder jigs and such. OTOH, it is likely at least 75 times faster too. > In any case carbide is best for cutting steel, I think because it can > be made into a more effective shape with a better angle. I have ground a cemented carbide tool to the shape I needed. I burned thru about $40 worth of dremel's diamond disks doing it because for that, the dremels lowest rpms is still 40x whats good for the diamonds. The ablation of diamond by the heat is a lot faster than watching paint dry. > Diamons are > typically just glued randomly to the end of a bit or blade and the > tiny sharp edges are randomly oriented > > On Thu, Aug 3, 2017 at 10:06 AM, John Kasunich <jmkasun...@fastmail.fm> wrote: > > Maybe.... but it definitely will remove a thin layer of the diamond. > > and another, and another.... > > > > On Thu, Aug 3, 2017, at 11:55 AM, Stuart Stevenson wrote: > >> Would that create a thin layer of casehardening? > >> > >> On Thu, Aug 3, 2017 at 10:02 AM, John Kasunich > >> <jmkasun...@fastmail.fm> > >> > >> wrote: > >> > It's not room temp when it is scraping across steel at a couple > >> > thousand surface feet per minute. (Or even a couple hundred.) > >> > > >> > On Thu, Aug 3, 2017, at 10:52 AM, Gene Heskett wrote: > >> > > On Thursday 03 August 2017 06:54:02 andy pugh wrote: > >> > > > On 3 August 2017 at 07:39, Gene Heskett <ghesk...@shentel.net> wrote: > >> > > > > Playing with that $12 diamond disk, it looks as if it will > >> > > > > do a decent job of shaping HSS tooling given time enough to > >> > > > > do it. > >> > > > > >> > > > You probably want CBN (or conventional abrasive) for HSS. > >> > > > Diamond is Carbon. Carbon dissolves in steel. > >> > > > >> > > At room temps? 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
