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Jacobs Taper Chart & Question

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  • Jacobs Taper Chart & Question

    I was wondering what the deal is with the 33 JT. Is it an older taper size or some special purpose taper???

    Here is the chart..........large end and small end.


    JACOBS LARGE SMALL
    TAPER# DIAMETER DIAMETER LENGTH
    (A) (B) (C)
    ----------------------------------------
    0 .250" .228 .438
    1 .384 .333 .656
    2 short .549 .488 .750
    2 .559 .488 .875
    3 .811 .746 1.219
    4 1.124 1.037 1.656
    5 1.413 1.316 1.875
    6 .676 .624 1.000
    33 .624 .561 1.000
    ----------------------------------------

    JL....................

  • #2
    Dunno, butyou find it on every other medium size chuck you look at. Pretty darn popular.

    Something that got "standardized by accident", perhaps.
    CNC machines only go through the motions

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    • #3
      Don't know how they came up with calling it #33 either.
      It should have been between the 2 and the 6. Don't understand that either.

      JL..................

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      • #4
        It was 3. The engineer had a stutter

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        • #5
          In modern terminology it is really V3.3. It took three tries to get it right.



          Originally posted by lakeside53 View Post
          It was 3. The engineer had a stutter
          Paul A.
          SE Texas

          And if you look REAL close at an analog signal,
          You will find that it has discrete steps.

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