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  1. #1
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    Sep 2009
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    Default drunken threads!!!

    Hi guys,
    Can anyone tell me what causes drunken threads?
    I have threaded a hollow form and was making a top
    with threads to match the bottom but when they screw
    together it seemes to be uneven, which i think is called
    drunken thread ..........and i have not had a beer yet!
    Do i scrap both threads ? or can I find out which one
    is wrong ?.............. OH WELL ,,,, I NEED A BEER NOW,,!
    Attached Images Attached Images
    Cheers smiife

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  3. #2
    Join Date
    Apr 2005
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    Nerang Queensland
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    Default

    You need a relief, ie no thread bit, on the lid between the thread and the top. See my note on your photo and one of my ball boxes
    Attached Images Attached Images
    Neil
    ____________________________________________
    Every day presents an opportunity to learn something new

  4. #3
    Join Date
    Jun 2004
    Location
    Mareeba Far Nth Qld
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    Default

    Hi Smiife,

    Drunk threads can be caused by hesitating when striking the thread, and/or moving the chaser a tad too slow or too fast for that lathe speed. I have found that a speed of 350 rpm good for me. Try varying the speed a little and see if that helps. Often, just the fear of stuffing up a job affects your confidence.

    My advise is to get a piece of 50 x 50 and chase a thread, cut it off and do it again and again and again, until you have convinced yourself that you have it all by the throat.


    Jim
    Sometimes in the daily challenges that life gives us, we miss what is really important...

  5. #4
    Join Date
    Sep 2009
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    armidale.nsw.australia
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    Default

    QUOTE=dai senseI;921500]You need a relief, ie no thread bit, on the lid between the thread and the top. See my note on your photo and one of my ball boxes[/QUOTE]

    Hi neil,
    I tried what you suggested and it did line up better, then
    I thought I would just tidy up the two faces and the thread
    dropped through In to the hollow form and just spun around
    It hasn, t been a good day

    Quote Originally Posted by powderpost View Post
    Hi Smiife,

    Drunk threads can be caused by hesitating when striking the thread, and/or moving the chaser a tad too slow or too fast for that lathe speed. I have found that a speed of 350 rpm good for me. Try varying the speed a little and see if that helps. Often, just the fear of stuffing up a job affects your confidence.

    My advise is to get a piece of 50 x 50 and chase a thread, cut it off and do it again and again and again, until you have convinced yourself that you have it all by the throat.


    Jim
    Hi jim,
    I had another look at the base this morning,
    I put a round bar in the hole of the female thread
    and turn the lathe on slow , and It seemed oval ?
    Eg..only touching every turn and missing some of the time !
    So i started from scratch new insert and new top...male thread
    was perfect .. female thread too big ! ........ glue up new blocks
    start again......it ain, t been very sucessfull.....will try again tomorrow
    Thanks for your help , as always appreciated
    Cheers smiife

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