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Drill chuck arbor taper question?

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  • Drill chuck arbor taper question?

    I want to buy a new keyless chuck for my mill. The present arbor is a 6JT(R-8). For some reason the chucks for this arbor are really expensive. Is there a reason for this or is it just because there aren't many around and the supply and demand thing? I was thinking of just buying a new arbor but I'm not sure which taper to buy. Any advice is appreciated. Thanks!
    Russ
    I have tools I don't even know I own...

  • #2
    JT6 is the largest taper, and the chucks will be the most expensive.

    For the most part, the chuck selected will determine the taper mount. Get a chuck in the size/price range you want and then get an arbor to fit it.
    Jim H.

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    • #3
      Russ,

      Many people feel that Albrecht makes the nicest keyless chuck & they are available with an integral R-8 shank (Classic Plus model CP130-R8, or model CPD130-R8 with diamond impregnated jaws for holding solid carbide drills).

      I found a new-in-box Jacobs keyless High Torque on eBay (model 130-J6) and bought the R-8 to JT6 arbor. Made in Spain. Incredibly accurate at 0.0009" TIR.
      Barry Milton

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      • #4
        I could be wrong but isnt a jt5 the largest and 6 is down around the jt33?

        but anyway if you have a BP clone I hope you have a riser ring as a keyless chuck is longer than a normal one this makes drilling a pain in the back.

        [This message has been edited by IOWOLF (edited 03-11-2005).]

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        • #5
          <font face="Verdana, Arial" size="2">Originally posted by IOWOLF:
          I could be wrong but isnt a jt5 the largest and 6 is down around the jt33?
          [This message has been edited by IOWOLF (edited 03-11-2005).]
          </font>
          That's right, I replied too quickly, the JT5 is largest, JT6 & JT33 are between the JT2 & JT3. There is also a JT2A, which is a short taper.

          Jim H.

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          • #6
            Damn I'm good!

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            • #7
              Thanks guys! That's what I wanted to know. It is weird though...some chuck mfg in my catalogs still want tmore for a 6JT than for some bigger arbour size chucks. Thanks!
              Russ
              I have tools I don't even know I own...

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