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Thread: loose morse taper

  1. #1
    Join Date
    Dec 2007
    North Carolina Foothills

    loose morse taper

    I recently bought a set of collet chucks for my Jet mini lathe with a MT2 taper. I am having trouble keeping it from coming loose while turning. Any similar issues or comments to see if I am doing something wrong?

  2. #2
    Join Date
    Apr 2007
    No, not all of SoCal is Los Angeles!
    Had a similar experience with a drill press. Cleaned the chuck and taper thoroughly, and I mean thoroughly. All was well after that.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  3. #3
    Gary.....Check the end of your morse taper.....does it have a theaded hole in it? I use a morse taper jacobs chuck to hold my b/s mandrel. The jacobs chuck kept coming out while turning with it. Then I noticed the threaded hole in the end of the morse taper. I got a long 1/4x20 threaded bolt, washer and wing nut. I put the bolt with the wing nut and washer on it ...through the hole in handle on the headstock and screwed it into the hole in the morse taper. Then I tightened the wing nut up until the washer is pressed tightly against the handle. The morse taper....the jacobs chuck stays put and I can turn bottlestoppers.....
    Last edited by Ken Fitzgerald; 01-05-2008 at 03:59 AM.

  4. #4
    Join Date
    Oct 2006
    ABQ NM
    Glenn's suggestion was the first thought that came to me, too. Try cleaning the taper and the hole you're putting it into thoroughly with mineral spirits.

    Ken's suggestion for a piece of all-thread through the spindle is also a good recommendation after you get things cleaned up.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

  5. #5
    Join Date
    May 2007
    Rhode Island
    I got a jacobs chuck MT2 for my Jet mini. But mine doesn't have a hole in it for a 1/4 20 all thread:

  6. #6
    Join Date
    Oct 2006
    Tokyo Japan
    Gary, like the others say, check to see if it is clean, and then, if you have a threaded hole, make yourself a "Draw Bar".

    Check out this thread for more info.

    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  7. #7
    If you read the warning (CYA) label on a jacobs chuck with Morris taper, it will say "For Tailstock use Only" Because the extra size and force exerted, exceeds what a Morris taper will control in that situation. With that type of fitting it may be necessary to add a threaded rod to hold the taper in place.

    Along with what others have said, Clean, debur, etc. Make sure there is more surface tension to control the taper. Even slight sanding dust and lint can create a gap and loose the surface tension. Sometimes WD40 sprayed on the hole and taper will act as surface tension sealer.

    Don't be afraid to give it a good "Thump" with a deadblow or wood mallot. (one reason I often have my students make a Mallot as their first project, you need one from time to time)

  8. #8
    Join Date
    Dec 2006
    Would you be able to drill and tap it for a draw bar.

  9. #9
    Join Date
    Jan 2007
    North Ogden, Utah
    I think they pack those things for the voyage from China in the same kind of grease that they cook eggrolls in. I know the eggrolls always loosen me up. Anyway, a thorough cleaning on both the male and female parts usually works. Remember if the collett chuck had any grease or oil it probably got a little inside the spindle of the lathe too.

  10. #10
    Alan DuBoff is offline Former Member (by the member's request)
    Join Date
    Nov 2006
    Last edited by Alan DuBoff; 02-27-2008 at 08:58 AM.

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