On 08/12/2016 03:39 PM, Gene Heskett wrote: > On Friday 12 August 2016 14:24:19 Gene Heskett wrote: > >> Greetings all; >> >> At what temp do I have to get a piece of hot roll to in order to >> soften the ultra hard core of the steel? Is it something this toaster >> oven can achieve given enough soak time at about 425F?
Add about 1000 degrees F to that for an anneal. >> Doing the hole, which I haven't tapped yet, for the 4mm gib adjuster >> screw last night, I started with a freshly DrillDoc sharpened quality >> 3.44mm bit. Drill Doctors are not a high quality or high accuracy sharpener but they are handy. They are known to leave a "heel" behind the cutting edge, that might be your problem, give it some more clearance behind the edge. I wore one of them completely out and am working on another. I had much the same problem building the front clamp. Cold rolled would work much easier, but I'd have to buy that online, whereas the hot roll is in the bins at TSC. Good hot rolled drills easier than CR, bad HR may have hard spots. I drill a LOT of both. If you have doubts about the quality cut part way through with a hacksaw and bend it, and look for an obvious change in texture > I found a pdf, from ASM International, 18 pages describing in text and TT > maps, what happens to steel as its heated and cooled. But somehow I am > failing to make the connection to the temp, time at temp, and cooling > rate to get the easiest to machine finished piece. For most low or medium carbon steel heat to 1450F and cool in the furnace or if no furnace bury it in Vermiculite insulation to cool to under 100F > Thats ASM #05144G. > The fact that the TSC stuff carries no label describing its alloying > materials and percentages is also "missing" info. Unless otherwise marked TSC steel is 1008 to 1018 steel alias A36. > > I know in the early '50's that making the stuff drillable for cotter keys > in the ends of some 5/8" shafting about 15" long was a matter of heating > them pretty bright red on the ends, and air cooling, but other than > necks of ammo being annealed for reloading longevity, that is about the > extent of my knowledge if you throw in what you can do to a puddle of > steel with a smith wrench. That is a whole science in and of itself. > > So, some recommendations, particularly for just the maximum machining > ductility, and how best to measure that temp on the cheap, would be much > appreciated. Heat with a torch to IHC tractor red and cool slowly, if you do not prefer IHC then try Massey red. Ed. ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
