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  1. #31
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    Mar 2019
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    Indeed it was. Once again I could not get it started so I cut it in half to confirm either way. The mystery has been solved.

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  3. #32
    Join Date
    Sep 2008
    Location
    North Carolina, USA
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    2,327

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    Quote Originally Posted by 88rob88 View Post
    Indeed it was. Once again I could not get it started so I cut it in half to confirm either way. The mystery has been solved.
    If the nut threads conform to the spindle thread, you have a tool to repair the damaged thread. Lock the spindle by putting a couple loops of rope around the pulley, tying that off and then winding a bunch between the hand wheel and headstock. Oil the spindle thread and put the halves of the nut on the spindle, grab the half nuts with big arc joint pliers and squeeze hard and unscrew. Depending on the relative hardness of the nut and spindle you might scrape off a little of the bumps. If so, repeat until the nut easily unscrews. Turn the half nuts around so you get fresh sharpish edges. If this does not remove any metal from the spindle, you should at least get the high places shiny, which you can carefully file or sand off.

    Once the half nuts, or better a intact nut, being sure you have the right pitch and thread shape, goes all the way on and off, you may use a die to carefully clean up the threads. If you do not have access to a die, wet the spindle threads and put a paste of abrasive household cleaner, valve grinding compound, or abrasive hand cleaner on the threads and run the nut back and forth a few times. Clean off the grit from the spindle and nut, oil up and try. If it runs on and off without being catchy, you are done. METICULOUSLY clean all the grit off the spindle and lightly oil.
    So much timber, so little time.

    Paul

  4. #33
    Join Date
    Feb 2019
    Location
    Vic
    Posts
    22

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    Hi,
    I can tell you that there certainly is such thing as an Ajax thread and many years ago a lot of tools & machinery used it. Unfortunately I can't tell you much more as my memory left me years ago and it's 40 years since I was a machine setter, I just remember having to buy an ajax thread adapter for a metal lathe I had.

    BTW. The ajax thread as far as I know has nothing to do with Ajax Fasteners, the Aussie nut & bolt company.

  5. #34
    Join Date
    Sep 2008
    Location
    North Carolina, USA
    Posts
    2,327

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    As I have more time than good sense, I kept looking for Ajax threads. Machinery's Handbook 1978 20th edition has nothing, Google search turns up two Ajax bearing materials. A question on Practical Machinist Antique Machinery and History brings up the question of could it be Acme Thread, and a Hercules Ajax Lathe:



    A search for Ajax Lathes finds this: https://www.ajax-mach.co.uk/ Tony's Lathes UK has nothing.
    So much timber, so little time.

    Paul

  6. #35
    Join Date
    Jun 2005
    Location
    Townsville. Tropical Nth Qld.
    Posts
    1,243

    Default

    I also did a search and while I am not convinced that the Ajax thread did not exist, I can't find any reference to it.
    This is my go to site, but it does not have every thread, but most of them.
    https://www.gewinde-normen.de/en/index.html
    Rgds,
    Crocy.

  7. #36
    Join Date
    Feb 2019
    Location
    Vic
    Posts
    22

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    A quick google produced this reference. It's not very useful but certainly indicates the existance of the thread.

    https://www.upsidebuilding.com.au/ez...ad-adaptor-x-2

  8. #37
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    Feb 2019
    Location
    Vic
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    22

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    I'm 'reasonably' conifident that it was pre-metric.

  9. #38
    Join Date
    Apr 2006
    Location
    near Mackay
    Age
    59
    Posts
    4,628

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    Quote Originally Posted by BigBloke View Post
    A quick google produced this reference. It's not very useful but certainly indicates the existance of the thread.

    https://www.upsidebuilding.com.au/ez...ad-adaptor-x-2
    Be nearly worth buying one to see what it looks like.
    I would like to see the specifications of this thread.
    ​Brad.

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