On Tuesday 23 February 2016 04:21:11 andy pugh wrote: > On 23 February 2016 at 02:59, Gene Heskett <ghesk...@wdtv.com> wrote: > > I looked in the handbook, I made the cutter out of A2, which needs > > 1700-1800F for first heating, is air quenched, then annealed by > > bringing it back to around 1300F but didn't see for how long, or > > what they call an air quench. But I don't think I've any way to get > > it up to 1800F in the first place. Best heater I have ATM is a nat > > gas fired 4 burner cook stove, or a bernz-o-matic > > I would imagine that you can do it with the Bernz-o-matic, but you > would need to be using MAPP gas and a firebrick hearth.
Funny thing about mapp gas + the yellow oxygen, I bought 2 each and a micro-torch, found the valves were uncontrollable and put it on the shelf including the un-tapped cans. 18 months later I thought I'd make another pass at making it work, and all 4 cans were empty! I'll have to see if I can find another kit the next time I am someplace that may carry it, depending on how long this A2 stays usably sharp without being hardened. Firebrick I think I could source there too. But I'd only need a crucible about the size of a large communion cup. > I have certainly heat-treated moderately-sized parts that way. > I see this on ebay.com > http://www.ebay.com/itm/131543951302 That looks like it would take a serious amount of fire for something that big. Just 3 bricks should be plenty of backdrop I'd assume. This seems like it might be a use case for a prince albert can full of bone meal and a blacksmiths charcoal forge. Even a wood fire fed by a vacuum motor blowing into the bottom ought to get hot enough for that & I need a good excuse to burn some yard trimmings anyway, or even a couple snow shovels full of scraps from behind the chop saw. A bag of fire clay & a tin gallon paint bucket would make a big enough forge for this. A central hole just the right size to stack it full of charcoal briquettes. Thanks for the brain tickle, Andy. 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> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
