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  1. #1
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    May 2010
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    Haas TL1 new to threading

    hello all,
    I am new to cnc lathe work, learning it as I go and all. I have a job that is going to require threading a piece of 1 inch for 1-8 NC threads. I'm doing this on a Haas TL! and have been using the Visual Programming for most of what I've done so far. I have tried some test threading on it using the VPS and the info in t he workbook but so far it hasn't turned out right. I am wanting to thread these so I don't have to run a die over them of if so take a minimum off with it. Right now the pieces are turned to 1.001 or so diameter. Could someone post a code that would get me close to finishing like I want.? As in how deep per pass and final depth and all. I realize I may have to make minor adjustments but I would like to start close.

    I appreciate any help you can send

  2. #2
    Community Moderator Jim Dawson's Avatar
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    Re: Haas TL1 new to threading

    I normally turn the OD 0.990 - 0.995 for a 1'' - 8, then adjust the cutter comp to get the thread fit I want.
    Jim Dawson
    Sandy, Oregon, USA

  3. #3
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    Re: Haas TL1 new to threading

    You will need to be more specific
    what type of material
    type of coolant used
    length of thread
    type of threading tool being used crest forming or not crest forming
    any coatings on the insert
    what class of thread 1a,2a or 3a
    all these will make a difference in what kind of answers you will get

  4. #4
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    Quote Originally Posted by rcs60 View Post
    You will need to be more specific
    what type of material
    type of coolant used
    length of thread
    type of threading tool being used crest forming or not crest forming
    any coatings on the insert
    what class of thread 1a,2a or 3a
    all these will make a difference in what kind of answers you will get
    Yes I realized that after I posted but am just now getting where I can reply.
    Pre hardened A2 steel.
    Coolant is Cutter water soluble oil.
    Length of threads is about 1 1/4 inch.
    Threading tool is a kennametal carbide single point with I believe Tin coating.
    If have to look at tap to find class.

    Roughly what would your first pass depth be and how mamy passes? I know Ill probably have to tweak it some bit if I can get close it will help.

  5. #5
    Community Moderator Jim Dawson's Avatar
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    Re: Haas TL1 new to threading

    I would start with 0.005'' DOC on the first pass, and back off the step down on subsequent passes, with a final pass at 0.000 step down for a cleanup. Maybe about 12 passes or so.

    Prehard A2 is going to add another layer of complexity to this, it will work harden if you look at it wrong. Prehard A2 requires an aggressive feed to keep from work hardening, so in this case, since the feed is fixed by the thread, you will have to adjust the DOC/pass.

    I would start with a piece of 1018 CR shafting to get the setup correct, then switch over to the A2 and adjust the cutting parameters until it comes out like you want. You might concider getting annealed A2 and heat treat after machining. For setup, 303 SS machines a lot like annealed A2, and is a lot less expensive.
    Jim Dawson
    Sandy, Oregon, USA

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