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  • thread cutting

    Hi All,
    I think i'm having a senior moment - if I get a set of dies for a coventry die head can I use it to cut other threads with the same pitch than the size it was designed for.
    Its just that I think if the tpi is correct then you should be able to cut any size at the same tpi but then I think weel it says only one size on the die!!
    Any thoughts
    Peter
    I have tools I don't know how to use!!

  • #2
    Changing the diameter changes the helix angle of the thread....so I don't think it will work.
    ----------
    Try to make a living, not a killing. -- Utah Phillips
    Don't believe everything you know. -- Bumper sticker
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    • #3
      I thought from the design of the cutters they cut on the diameter and have a rake to the cutting edge so I thought the rake would not make much of a difference.
      Anyone know!!
      Peter
      I have tools I don't know how to use!!

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      • #4
        Sorry no.

        The dies for a Coventry die head are 'sized' according from the distance from the face to the engagement notch.
        so 1/4" x 20 dies will be longer than 1/2" x 20 to reach further in.

        There is some + and - adjustment on these heads but not enough to get to the next range.

        There is nothing to stop you taking one orphan die segment and using it in a holder to screwcut any diameter of that pitch.

        Example on left.




        .
        .

        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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        • #5
          Thanks Sir John that is what I was thinking about it means I will have spare dies but I would only need the common metric pitches and only those for the finer threads. Perhaps I should have said chasers.

          Peter
          I have tools I don't know how to use!!

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