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Thread: Chuck key

  1. #31
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    Quote Originally Posted by riverbuilder View Post
    Maybe just buy a 10 mm and file 0.5 off each face? Wouldn’t take very long I would think.
    Hmmm, you might need a pretty special filing technique! (and file) A surface grinder might be better.

  2. #32
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    Hi Guys,

    Someone missed the filing classes
    Best Regards:
    Baron J.

  3. #33
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    I’d like to buy my files where you do!

    Quote Originally Posted by riverbuilder View Post
    Maybe just buy a 10 mm and file 0.5 off each face? Wouldn’t take very long I would think.

  4. #34
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  5. #35
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    Quote Originally Posted by riverbuilder View Post
    Maybe just buy a 10 mm and file 0.5 off each face? Wouldn’t take very long I would think.
    I already suggested buying a ⅜" key and filing or milling 0.25mm off each face (post #7). Why file off more than you have to?
    Chris

  6. #36
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    Quote Originally Posted by jack620 View Post
    I already suggested buying a ⅜" key and filing or milling 0.25mm off each face (post #7). Why file off more than you have to?
    Exactly, that’s why I used a 3/4” 4 flute Sutton end mill... only filing required was to break the edges

  7. #37
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    Hi Guys,

    Quote Originally Posted by sailor View Post
    I’d like to buy my files where you do!
    Most of my files are at least 50 to 60 years old or more. Some of them belonged to my grandfather. Many were given to me by a mentor in my youth. The only ones that I've actually gone out and bought for my self have been diamond ones.

    I actually have to go to Birmingham at some point to collect a couple of dozen of them that a friend is looking after for me that came from a locksmiths factory there.

    Filing is not too onerous, reasonably hard work, yes, but like all other skills it takes time to learn !
    Best Regards:
    Baron J.

  8. #38
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    Quote Originally Posted by BaronJ View Post
    Hi Guys,

    Someone missed the filing classes

    I don't enjoy hand filing hardened material with an ordinary file (that's what my reference was all about). I do enjoy filing though, and remember my classes!
    I've not had the pleasure of viewing or using a diamond file. Another item for my wish list now, as if it wasn't long enough already!

  9. #39
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    Are chuck keys hardened?
    Chris

  10. #40
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    Hey baron I’m not surprised you find filing hard work with 60yo files.. they’re probably duller than most apprentices..

  11. #41
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    Quote Originally Posted by jack620 View Post
    Are chuck keys hardened?
    Possibly, I’d assume a Rohm or Jacobs would be, probably less so Ozito.
    If you have one you wish to test grab a file and try it, if the file cuts it’s not hardened.

  12. #42
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    Quote Originally Posted by jack620 View Post
    Are chuck keys hardened?
    Yes definitely, and the base material is not just 1018/20 either. Usually made of something like 4140 and generally through hardened. Case hardening would be likely to crack over time so they don't go down that path. Ever try to straighten a bent chuck key? (usually doesn't end well!)

  13. #43
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    Quote Originally Posted by Smoothoperator View Post
    If you want the original item they are available from Pratt Burnerd. I'm waiting for a price bit not expecting it to be cheap. I Imagine once I get a price and pick myself up off the floor I'll end up spinning one up out of some 20mm 4140 stock. Providing you have a mill it's not a major job to make one.
    FWIW - The local supplier called me back today with a price of $153 for an OEM PB 9mm chuck key. Needless to say I'll be doing something with that piece of 20mm 4140 sitting in my stock pile!

  14. #44
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    Hi Adam,

    Quote Originally Posted by racingtadpole View Post
    Hey Baron I’m not surprised you find filing hard work with 60yo files.. they’re probably duller than most apprentices..

    Some are just heirlooms ! Surprisingly some of the old ones cut better than the newer ones. I would guess that in an industrial setting its easier to just get a new file out of the stores than struggle or find one. I've three cardboard trays full of files to go at. Sadly no apprentices
    Best Regards:
    Baron J.

  15. #45
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    Quote Originally Posted by Smoothoperator View Post
    Yes definitely, and the base material is not just 1018/20 either. Usually made of something like 4140 and generally through hardened. Case hardening would be likely to crack over time so they don't go down that path. Ever try to straighten a bent chuck key? (usually doesn't end well!)
    Your thoughts may differ but I see no reason to use anything exotic to make a chuck key from. I made sailors from a piece of mystery metal. Some applications need material like 4140, I don’t see a chuck key being one of those applications. The picture of the one made from square bar chewed by an angry beaver earlier in the thread tends to support this theory

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