How does grinding affect heat treat

Discussion in 'Edged Tools' started by Pete638, Dec 6, 2018.

  1. Pete638

    Pete638 Tracker

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    I recently picked up a Turley green river second hand. It’s a varied grind and both sides were touched up. The tip was busted and smoothed over. Still a good knife but I’m wondering how the grinding affected the heat treat. Any and all info much appreciated.
     
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  2. Scotchmon

    Scotchmon Supporter Supporter

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    I’d think as long as the blade didn’t get overheated, it should not have been effected. Gotta keep em’ cool. If it’s too hot to hold, better cool it down.
     
  3. central joe

    central joe Supporter Supporter Bushcraft Friend

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    Yep, depends on how hot ya get it. joe
     
  4. Mikewood

    Mikewood Guide

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    Evaluate it.

    Sharpen it to razor sharp and start slicing cardboard and free hanging paper. If the edge does not last last you don’t have much. If you can do a lot of cuts you got good steel.
     
  5. Zaveral

    Zaveral Supporter Supporter Bushcraft Friend

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    Who did the grinding? If Iz did it then it is good to go. Otherwise then it would need to have been kept cool while grinding.
     
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  6. batmanacw

    batmanacw Guide

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    The knife was ground to make it what it was to begin with. Grinding doesn't hurt a thing. Over heating is the problem with poor quality grinding. You can get a knife blade hot enough to blister skin and not hurt the temper. As long as the steel doesn't change color it's fine.
     
  7. Mookietherooster

    Mookietherooster Scout

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    When you say (grinding) what are you referring to, a bench grinder or actual knife grinder? Who did the grinding?
     
  8. Pete638

    Pete638 Tracker

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    The first owner of the knife regrinded it and fixed the broken tip. The knife still looks in good shape but it’s been through the ringer.

    I processed some wood and make a fire with it. Still is pretty sharp. I’ll need to do more work with it before coming to a conclusion.
     
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  9. riokid87

    riokid87 Scout

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    My thoughts are it doesn't matter if you are putting the initial geometry on a knife you are making, changing the geometry of an existing blade, or fixing a large chip or broken tip.
    Whatever temp the blade was tempered at iot get it to the current hardness, if you heat it past that you will soften it.
    Problem with grinding on a finished blade is the thin edge and tip will heat faster than the thicker areas and you can ruin an edge or tip very fast with the suddeness of a broken shoe lace.
    If you're wondering if someone else ruined it by grinding it all you can do is sharpen it, use it, and see.
    If you want to reprofile it yourself, go slow. A slow speed grinder with a new sharp belt. Cool the blade often. May even consider doing final grinding by hand.
    Good luck
     
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  10. 66drifter

    66drifter Guide

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    an ole blacksmith friend of mine shared with me his point of view

    he always works bare handed which informs him what he is doing to the work piece

    as the work piece begins to warm up it is time to cool it off

    i have adopted his method when working with sharps also

    when the metal gets warm STOP n cool it off before proceeding

    so far i haven't skunk'd myself ;-)
     
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  11. Pete638

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    Looks like I have some work to do. Got a great price and it has a pommel plate. Kind of a spur of the moment purchase. They really don’t last long on the market and I won’t feel bad about scratching it up.
    Thanks for all the information!
     
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  12. Madwell

    Madwell Supporter Supporter

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    I can’t say for sure weather or not the regrind hurt your heat treat. I can can say for sure we all want to see pictures of your Turley.
     
  13. Ptpalpha

    Ptpalpha Supporter Supporter Bushcraft Friend

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    What @Madwell said. Pics please! Love seeing hard-use Turleys!
     
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  14. Pete638

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    I can do that! I’ll post them later today.
     
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  15. Pete638

    Pete638 Tracker

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  16. Pete638

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  17. Mookietherooster

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    That's a pretty cool looking knife. Who sells them, and how much are they? I've not seen them at any knife shop or stores.

    Never mind. Another stupid question of mine. I guess these are another custom knife that can not be purchased at the store.
     
  18. Pete638

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    Turley knives. He has one of them up in the store I believe. A Haw creek. Different from this knife though.
     
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  19. Bax 40

    Bax 40 Supporter Supporter

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    Iz Turley is a outstanding gentleman and knife designer and maker who was very active on this forum for a long time, he has pretty much moved on to greener pastures.

    His knives have brought upward of $1000 bucks on occasion and when I last looked he was booked for several years and had quit taking orders.
    He is a one man shop as far as I know.

    Larry
     
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  20. Pete638

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    He now sells his knives on a first come first serve basis. Just have to be quick to the draw. Very quick.
     
  21. Pete638

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    Everything got quiet after posting the pictures. Any thoughts on the condition of the knife?
     
  22. Mookietherooster

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    Looks ok to me, but then again, I never heard of Turley till just recently.
     
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  23. Zaveral

    Zaveral Supporter Supporter Bushcraft Friend

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    It looks great. I wouldn't mess with it.
     
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  24. Pete638

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    Awesome thank you!
     
  25. Mookietherooster

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    Generally there would be color change, (blueish) especially at the edge, and/or tip from getting too hot. I'm not seeing any of that, so I would say it's fine.
     
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  26. 66drifter

    66drifter Guide

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    a correct observation

    however buffing can remove that discoloration while softening up harsh edges providing a FINISHED LOOK
     
  27. PLackey

    PLackey Supporter Supporter Bushclass I

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    It doesn't. Only someone really inexperienced would be aggressive enough to overheat the blade that much and most damage is right at the surface, removed the first time you sharpen.

    The tip is the place you have to be most careful. It can go quick.

    Test it. Stab it in some wood and pry it out sideways. If the tip holds up it's likely fine.
     
    Last edited: Dec 10, 2018
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  28. gdpolk

    gdpolk Hobbyist Hobbyist

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    Grinding doesn't affect the heat treatment. Heat affects the heat treatment. Since most of Iz's knives were made in 01 steel and it is annealed at 400*F, as long as the blade (particularly the tip) didn't exceed 400*F then your good to go. At this temperature it would turn a "faint straw" color which has kind of a goldish hue and would be most noticeable directly at the tip on the spine. If the blade was kept cool and hasn't discolored then there is no reason to be concerned.
     
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