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Did they ever make a JT3 ot JT4 adapter

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  • Did they ever make a JT3 ot JT4 adapter

    I have 2 Jacobs 19N 3/4 chucks, both have JT4, my drill press has JT3 in the
    spindle and it ain't coming out so I am stuck with a JT3 spindle. This is a large
    20" swing HF production drill press and I want to use the big chuck on it.
    Does anyone know if they ever made a JT3 to JT4 adapter?

  • #2
    Short answer, no, they do not make JT adaptors.
    Jim H.


    • #3
      Yes they do make MT adapters assuming you meant Morse taper,KBC and the other usual suspects have them- item# 1-5161-045 $22.80

      BUT,it would be better if you can replace the arbors since the extension sockets eat up daylight under the quill.Can you see the end of the shanks looking in the chuck?
      I just need one more tool,just one!


      • #4
        If you can't get the MT/JT arbor out of the spindle, why not remove the spindle and machine it out? It seems it would make the machine a lot more useful to you. Does the machine not have the removal slot in the quill for the MT arbor? Did it get put together w/ locktight or something? Most of the time, you can get them out, but you might have to get creative...


        • #5
          Its stuck good, I did use a drift tool

          Tried a drift tool with a hammer, then took the spindle out and put on my arbor
          press. Still couldn't the drift tool to push the arbor out so I just gave up on the idea of removing it.


          • #6
            Tap the drift in til it sticks and warm the spindle up with a heat gun.It may take 15-20 minutes of heat to warm the spindle and housing up,but usually it will expand the bore enough for the arbor to loosen up.
            I just need one more tool,just one!


            • #7
              Getting the existing arbour out and replacing it with a JT4 arbour is the best solution.

              Not all drill drifts are the same - some have fairly steep tapers - maybe find or make one with a shallower taper. Heating the spindle's a good idea too.

              If it *really* won't come out, then making a JT3 to JT4 adaptor should be possible - it's just a short sleeve tapered inside and out. Wall thickness would be about 0.16", which is manageable.

              JACOBS LARGE SMALL
              0 .25000" .22844 .43750
              1 .38400 .33341 .65625
              2 .55900 .48764 .87500
              2 short .54880 .48764 .75000
              3 .81100 .74610 1.21875
              4 1.12400 1.03720 1.65625
              5 1.41300 1.31611 1.87500
              6 .67600 .62409 1.00000
              33 .62401 .56051 1.00000

              All of the gear, no idea...


              • #8
                I wonder if rust got in there. That allways makes em stick real good, usally seems to form after awhile of non use -_-;
                Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.


                • #9
                  NO Rust the drill press was new

                  This was a new HF 20" swing production drill press that had been dropped before it was sold, on the head not the spindle. I purchased it and tried to repair some small problems. I didn't get the chuck, motor or table crank gear/handle. I was going to replace the chuck with a better one anyway, everythings done but the chuck. I having 2 - Jacobs 18N super chucks not in use so I really need to get one fitted to the drill press.