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Thread: Need baselines for turning Damascus

  1. #1
    Join Date
    Jan 2019
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    Juneau
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    Default Need baselines for turning Damascus

    Hello all

    Just acquired a .981 round of Damascus I want to turn down into a ring, yes ring for a finger. Any suggestions would be helpful.

    ....oh yeah, will be using 1/2 c6 grade brazed carbides likely.

    Machine is a little machine shop hi-torque 3540 8.5x20

    Thanks in advance!
    Matt

  2. #2
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    Jan 2019
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    Juneau
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    Default

    Looking for baseline rpm

  3. #3
    Join Date
    Nov 2007
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    Woodinville, WA
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    Default

    urgh... import brazed carbide...

    But moving right along... start at 200-300SFM (800-1100 rpm aprox), then increase or decrease as required so your swarf/chip (if they break) are dark brown to light blue.
    Last edited by lakeside53; 04-15-2019 at 12:43 AM.

  4. #4
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    Default

    Quote Originally Posted by lakeside53 View Post
    urgh... import brazed carbide...

    But moving right along... start at 300SFM, then increase or decrease as required so your swarf/chip (if they break) are dark brown to light blue.
    No I learned my lesson long ago with import cutting tools. Same ones I use at work line boring

  5. #5
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    Juneau
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    Default

    Thank you though for some baselines

  6. #6
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    Nov 2007
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    Default

    good

    Positive rake DPxx 22x inserts work well on that type of machine. Chips will break etc.

    But seriously, don't get too worried about an exact rpm... the chip/swarf color (and any "chatter") tells you a lot about what is correct for the particular material, DOC and feed.

    You might want to anneal your "Damascus" first... Exactly what is yours made from? Some have a high stainless component
    Last edited by lakeside53; 04-15-2019 at 01:15 AM.

  7. #7
    Join Date
    Dec 2016
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    Helsinki, Finland, Europe
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    Default

    If it is low alloy carbon steel damascus just go at it, shoudn’t be too difficult to turn. BUT I wouldn,t make rings out of it, very prone to rusting. ”Damascus” exist also made from stainless steels, titanium or even HSS tool steels and if yours is one of those turning can be more interesting.

  8. #8
    Join Date
    Jul 2014
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    A bit to the West of Portland Oregon
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    Default

    "Damascus" is the Capitol of Syria.

    Which steels were used to make your pattern-welded billet? Are they annealed, normalized, or as-forged? The correct feed, speed, and angles for know steel are well known. The correct feed, speed, and angles for mysterium are "whatever."

  9. #9
    Join Date
    Oct 2006
    Location
    Ivins, Ut
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    1,371

    Default

    Quote Originally Posted by Lee Cordochorea View Post
    The correct feed, speed, and angles for mysterium are "whatever."
    That's why lakeside53's comments are probably the most helpful and relevant. No one here, or anywhere else 'knows' what it will take because of all the particulars we don't know. Anyone here, regardless of experience, would go about determining the parameters in the way lakeside53 describes.

    Good luck, and please post some photos of the finished ring. By the way, rust can be mitigated with various coatings, including clear powder-coat.

  10. #10
    Join Date
    Jan 2007
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    Minnesoa
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    Default

    Hi,

    If you don't know the steels used to make it, take a file to a corner of it to see how it will cut. Does it cut freely? Does it cut with difficulty? Does the file just skate? That will give you a base line idea of where you can start. Then you need to read the chips as they form.
    If you think you understand what is going on, you haven't been paying attention.

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