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  1. #1
    Join Date
    Aug 2009
    Location
    Brisbane
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    24

    Default Live Centre and Drill Chuck problems

    I recently bought a live centre and a 13mm 'jacobs' chuck, both MT2 to fit my Hercus tail stock. One bought from Carbatec, one bought from Hare & Forbes.

    Foolishly, I thought all MT2 shafts were equal. Well, just so happens that the shafts of both are too short, meaning winding the tail stock thing all the way in doesn't nudge the tools out as it does with all my dead centres that came with the lathe.

    I now have to resort to wrapping them in cloth and bashing them out with a block of wood. Today, the live centre got so jammed in I had to take out the entire slide and feed a steel rod up inside the tap it on the cement floor.

    Think I'll have to try and extend the shafts somehow, or else buy another couple of hopefully longer-shanked tools.

  2. #2
    Join Date
    Nov 2005
    Location
    adelaide
    Posts
    597

    Default

    mine does that too ....model c....I use a soft faced hammer to remove .. it has worked so far i even changed the sleeve to a newer one and didnt make any difference so i think its the way they make the morse tapers .. keep m short it saves 5 cents worth of steel

  3. #3
    Join Date
    Aug 2009
    Location
    Brisbane
    Posts
    24

    Default

    Well, I'm glad to hear it's not just me then. I was thinking of brazing an extra length on. Fortunately, the MT2 shank 17mm drill I bought last week is long enough to be nudged out.

  4. #4
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    One thing you can try that wont involve to much effort is to ,
    Insert your Taper Shank Drill into you Tail Stock, Note how far the Drill goes into the Quill(mark it),remove and measure the length from the mark to the End of the Drill Tang.
    Compare this to the Tools you want to use,(this distance will be the amount you are short in being able to eject by).
    Make a suitable extension up to suit your Tooling and either use Silastic or similar to attach to the End of your Tooling,This should then allow the Tools to be ejected in the normal manner.

  5. #5
    Join Date
    Aug 2009
    Location
    Brisbane
    Posts
    24

    Default

    Thanks Pipclay...yeah, that's probably the most practical way to go about it. Cheers,

  6. #6
    Join Date
    Apr 2009
    Location
    Marsden, QLD
    Posts
    93

    Default

    Go get a 10mm nut and if you got a welder, place the nut on the tang where it's too short, now just weld a dob into the threaded area of the nut so the nut sticks to the tang.
    Try it out in the tailstock, if required, go use the grinder till it fits to how you want it too.

    Problemo SOLVERED.

  7. #7
    Join Date
    Dec 2007
    Location
    Brisbane
    Posts
    26

    Default

    Quote Originally Posted by ausdag View Post
    I recently bought a live centre and a 13mm 'jacobs' chuck, both MT2 to fit my Hercus tail stock. One bought from Carbatec, one bought from Hare & Forbes.

    Foolishly, I thought all MT2 shafts were equal. Well, just so happens that the shafts of both are too short, meaning winding the tail stock thing all the way in doesn't nudge the tools out as it does with all my dead centres that came with the lathe.

    I now have to resort to wrapping them in cloth and bashing them out with a block of wood. Today, the live centre got so jammed in I had to take out the entire slide and feed a steel rod up inside the tap it on the cement floor.

    Think I'll have to try and extend the shafts somehow, or else buy another couple of hopefully longer-shanked tools.
    Hi,
    If the taper end has a thread in it you can machine up an extension that will screw into the thread.
    This will give you the additional length that you require.
    Saves welding, glueing and is more professional.
    Look at it as a small project.
    I have done this to my live centre that was purcased on ebay, it works and looks great.
    Regards Marc.

  8. #8
    Join Date
    Jan 2009
    Location
    Captains Flat
    Age
    71
    Posts
    122

    Default

    I have same problem. I wind the tailstock out until I can rest a steel rule between back edge of revolving centre and the tailstock cone. I then unwind the tail stock, the steel ruler stops the revolving centre being drawn in and thuse causes it to eject using the tailstock screw as the "power source". This solution no good for non-revolving centre however.

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