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Michael

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  1. As Scott said, that's part of what I was trying to say.In other words I'm trying to say that maybe the polymer quenching introduces a state that is a bit more "on the edge" (or unstable) in the quenching mechanical evolution and the energy introduced during the tempering is sufficient to make it evolve further. While the oil or water quench would create a more stable state (obviously I guess) hence not being signifiantly affected by tempering. Now on the metallurgical importance of the secondary transformation during tempering (retained austenite , etc..) I don't know how much of an effect it
  2. I love it! In fact you're just making tools to use your other tools I know the feeling! Guilty! That's a beast though and super engineered too. Thanks keep them coming.
  3. Bare with me here for I have little or no practical experience with this, but I have been pondering and reading everything I could find about this phenomenon for years now. I briefly discussed it with John Verhoeven too but not far enough to reach any deep conclusion. I'm strongly suspecting that the difference in curvature (oil/water) and in this case polymers has more to do with pure mechanical effects than metallurgical one. 1- The "speed" of quenchant is not a single characteristic, it's more like an average. Reality seems clear that in fact each quenchant (due to various effect, one bei
  4. I explain to him: Juste des photos. "sneak peek pictures" est un terme generique pour un docu photo, des "photos qui revelent" mot a mot. So yes he's speaking about this kind of pictures. And it's not "from bloom". It's smelted steel from scraps (acier de grappage) or smelted steel from ore (acier de reduction). The bloom is what you obtain after the smelt (la loupe). Incroyable! And he's not telling it all in English, modesty oblige, like he's only been at this for a year or so and it's his first smelt I believe, and maybe his second damas (I can't remember). :notworthy: Thankf
  5. All those techniques (copper block, torch) are basically an identical phenomenon to what is commonly used in welding straightening and body work (how to flatten a steel panel or take the spring out of it). The principle of it can be best illustrated by a simple experiment. Affix a little steel bar within the open branches of an U made of heavy steel (to obtain sort of a square with one branch thinner). Then heat up the thin branch, if properly done when it's cooled down the thin branch will have been broken in traction or the U will have been deformed inwardly. That symbolizes what is happen
  6. How about some like this (different process, induction)? http://www.richieburnett.co.uk/indheat.html
  7. I just saw bearings by the unit at Orchard Hardware Supply the other day. I don't know the dimensions, but it seems about right.
  8. Well here is one: http://www.multiplaz.com/about.php Very interesting for all kind of processes. I wonder how good it works.
  9. From my notes, I never tried them but here it is if you want to try: To free rusted parts, a coast guard trick, heat up the part, put parrafin wax on the hot nut that will melt and sip in by capilarity. Someone else mentionned PB B'laster that you get at auto shops, soak and tap every couple hours until free. Both supposed to be way better than WD40.
  10. Smart and Final 40lbs bag for $12.99 and that's L.A. Mesquite charcoal.
  11. Dan, Randal, how about this, it may help. If you know already, never mind (click "tsukamaki", there is even the link to the pattern): http://www.zatoichi.de/katana_01/index.htm
  12. Great! What metal did you use?
  13. Some clay recipes do not include charcoal and they seem to be effective too (I guess satanite is one of them).
  14. I think what Tyler was asking was a slightly different question. So I will attempt to answer that. There is no "equivalence" between sets of quenching medium (water, oil) and quenching temperature. In other words a specific steel requires a specific quenching temperature (critical (Ac3)+50) regardless of the medium used for quenching, and a specific minimal cooling speed to obtain transformation. While steels quenchable in oil can certainly be quenched in water, it introduces stress, deformations and even cracks. If the oil cooling speed is sufficient for the particular steel (100% martensit
  15. Well here is my setting. As much as I'm traditional, I'm not about to bend over and tuck in like that. The stump has a step in it, and that holds the stone just fine. And because of the stump, I can put my legs to either side and have a very similar posture to the japanese one without hurting. The other thing I've seen is sort of a wide saw horse or an old carpenter shaving bench with a ledge to hold the stone.
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