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Early Jacobs chuck taper

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  • Early Jacobs chuck taper

    I have acquired a Jacobs chuck that I can't easily measure the taper
    but have tried a #3 and #33 and both are too large. Don't have any
    adaptors smaller. The info on the chuch is as follows:
    375 PORTOMATIC chuck 0 - 3/8"
    The Jacobs Mfg. Co.
    Hartford Conn USA

    Pat applied for.

    I checked the Jacobs web page and ther is no such model number
    listed. ( probably too old a model)
    Does anyone know if it is a #2 or short#2 or is it from before tapers
    were standardized? :-)
    Thanks
    ...lew...

  • #2
    How about a Jacobs taper #6 Bet thats it.
    Every Mans Work Is A Portrait of Him Self
    http://sites.google.com/site/machinistsite/TWO-BUDDIES
    http://s178.photobucket.com/user/lan...?sort=3&page=1

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    • #3
      Originally posted by Lew Hartswick
      .....Does anyone know if it is a #2 or short#2 or is it from before tapers
      were standardized? :-)
      Thanks
      ...lew...
      Lew,

      Machinery's Handbook lists, Usual capacities for each taper. #2 is for 0-1/2". #2a (short), 0-5/16". So, probably a # 2.

      .5590" Large end of plug, .8750" long, .48764" small end of plug.

      Lane, #33 is smaller than a # 6, and that did not fit.

      Cheers,
      Les H.
      The Impossible Takes Just A Little Bit Longer!

      Comment


      • #4
        Try a 2J Jacobs.
        Every Mans Work Is A Portrait of Him Self
        http://sites.google.com/site/machinistsite/TWO-BUDDIES
        http://s178.photobucket.com/user/lan...?sort=3&page=1

        Comment


        • #5
          .5590 (large end) is #2 Jacobs. Jacobs also made a .625 straight mount. Make sure it is indeed tapered.

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