What is a RJ33-13L need to replace my drill press chuck but How?

Discussion in 'General Engine Discussion' started by RMS, Dec 22, 2010.

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  1. Dec 22, 2010 #1

    RMS

    RMS

    RMS

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    Hey Guys!

    I have a Ryobi DP100 table top drill press but the chuck is garbage its kinda soft and after years of use the drill key is slipping from the worn out teeth. So I would like to replace it but how? There is no drift pin slot, so I am thinking its a thread on type but not positive. The chuck markings are RJ33-18L. To me this is a nice little table top drill press, its served me well for many years doing basic drilling operations (no plastic at all on this baby!) the only flaw I see is this soft chuck, other that that its smooth running.

    Rob
     
  2. Dec 22, 2010 #2

    Lew Hartswick

    Lew Hartswick

    Lew Hartswick

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    It sounds like it's a Jacobs 33 taper in the back of the chuck. It may require wedges
    to remove it. Does the spindle have a small shoulder just behind the chuck for the
    wedges to work against?
    ...lew...
     
  3. Dec 22, 2010 #3

    RMS

    RMS

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    Hi Lew,

    Yes it does.
     
  4. Dec 22, 2010 #4

    Lew Hartswick

    Lew Hartswick

    Lew Hartswick

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    Where are you located? Is there any other home shop types anywhere near that
    could possibly have a pair of J33 wedges to borrow. If you were close to Albuquerque
    we'd have it off in a hurry. :)
    ...lew...
     
  5. Dec 23, 2010 #5

    RMS

    RMS

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    Lew,

    Thanks for the help! I am in MASS, but actually I do have a couple of commercial shops around. But at least I can figure it has a taper so my next question would be once I get it off am I correct to assume that the chuck is threaded onto the tapper with a Left hand thread? Then finally what is the best option in replacing this? Can I get a Jacobs with an 18L to fit my existing taper?

    Thanks,
    Rob
     
  6. Dec 23, 2010 #6

    Lew Hartswick

    Lew Hartswick

    Lew Hartswick

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    If I'm correct in my "guessing" , the back of the chuck has a hole which is a
    Jacobs female taper, the spindle has a matching male taper, when they are
    put together (usually with a light impact or in severe cases by a shrink fit) they
    will really stay there. The wedges exert enough force to separate them.
    My really old Craftsman drill press has the same J33 taper but in addition a retaining
    collar, I've been tempted to get one of the keyless chucks like the Albrecht but
    could never come up with a method of matching the collar to it. Some of the other
    common tapers on the rear of chucks are J3 and J6 . That is what is on the bigger
    ones for the lathe tailstocks at school. So the "adapter" has a male Jacobs on one
    end and a Morse 3 on the other end to fit the tailstock ram.
    So there should be no threads involved at all.
    ...lew...
     
  7. Jan 23, 2020 #7

    bobbytbonee57

    bobbytbonee57

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    Will j33 interchange with RJ33
     
  8. Jan 24, 2020 #8

    BIGTREV

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  9. Jan 24, 2020 #9

    comstock-friend

    comstock-friend

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    100_1157.JPG Here are some Jacobs tapers (on Morse taper arbors). These of course are the 'male' side which should be on the OP's drill press arbor. Also shown are the 'wedges' referred to. Your Jacobs taper dimensions are shown here: http://www.davehylands.com/Machinist/Charts/Jacobs-Taper-Chart.png

    Oops! Suckered by a 10 year old post!
     
    Last edited: Jan 24, 2020
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  10. Jan 25, 2020 #10

    tornitore45

    tornitore45

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    If the wedges will not budge the chuck be advised that sometimes there is a screw inside the jaws cavity that need to be removed.
    My drill press had a regular RH Phillips Hd screw that I replaced with a Socked head
    My Makita hand drill, which is reversible, had a LH special screw before I lost it and had to make one.
     
  11. Jan 25, 2020 #11

    comstock-friend

    comstock-friend

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    The last post relevant to the OP was December 2010.

    bobbytbonee57 current question is "Will J33 interchange with RJ33". I believe they are two names for the same thing, a Jacobs 33 taper is a Jacobs 33 taper. I assume that the 'RJ' is a manufacture's part number for their particular 33 taper mount.

    To get pertinent answers, bobbytbonee57 should have started a new thread...
     

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