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  1. #1
    Join Date
    Feb 2013
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    Laidley, SE Qld
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    Default Removing tables from HM52 mill

    The Y axis on my Hafpos HM52 has suddenly decided to become almost impossibly stiff to wind back and forth. I can't see anything obvious, gib screws are still in place and tight, I'm thinking that chip has worked its way somewhere it shouldn't be so I'll remove the tables and investigate.

    It shouldn't be too hard, start from the top and burrow down, but if someone can share a few words of wisdom it will be appreciated.

  2. #2
    Join Date
    Jan 2004
    Location
    Mackay North Qld
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    6,446

    Default

    Hi Bob,
    I struck the same on a HM52 at a school where I worked.

    It had not been used for a while and it was found that the oiler was blocked -so no oil and the coolant had caused rust over the drive screw thread.


    There was a hard crusty orange rusty patch on the thread.

    Grahame

  3. #3
    Join Date
    Dec 2013
    Age
    56
    Posts
    1,416

    Default

    Hi Bob
    Undo the 4 nuts for the swivel, and the table and upper saddle will all come off together. There is a pivot spindle in there that is pressed into the lower saddle from memory.
    Then you can get to the lower saddle where you will find the Allen head bolt for the Y axis nut. I'll grab some pictures for you.
    Using Tapatalk

  4. #4
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    Dec 2013
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    Default

    Here are some pictures
    Using Tapatalk

  5. #5
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    Dec 2013
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    Default

    While I was in there I extended the Y axis travel to around 280mm.
    I made new sheet metal covers and added a millied block to the front. I also had to remove a little cast on the knee slot to allow the nut to come further forward.
    Using Tapatalk

  6. #6
    Join Date
    Apr 2009
    Location
    Ballina N.S.W.
    Posts
    644

    Default

    Hi Dave,
    Great to see you back posting again-I know you have been doing it for a while I have just been a bit slack. I remember when you did the total rebuild of your mill, fantastic workmanship, nice to see it again.
    Regards Bob

  7. #7
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    Dec 2013
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    Default

    Quote Originally Posted by krisfarm View Post
    Hi Dave,
    Great to see you back posting again-I know you have been doing it for a while I have just been a bit slack. I remember when you did the total rebuild of your mill, fantastic workmanship, nice to see it again.
    Regards Bob
    Thanks Bob, it's still going great and all that work has paid off.
    It's a shame what photo bucket did, most of the old threads lost there reference photos.
    Using Tapatalk

  8. #8
    Join Date
    Feb 2013
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    Laidley, SE Qld
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    Default

    Wonderful info Dave J, many thanks.

  9. #9
    Join Date
    Aug 2006
    Location
    Melbourne
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    1,105

    Default

    Have you tried the photobucket fix? https://chrome.google.com/webstore/d...giikdkpmcpkaon

    Quote Originally Posted by Dave J View Post
    Thanks Bob, it's still going great and all that work has paid off.
    It's a shame what photo bucket did, most of the old threads lost there reference photos.

  10. #10
    Join Date
    Dec 2013
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    56
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    Default

    Quote Originally Posted by Com_VC View Post
    Have you tried the photobucket fix? https://chrome.google.com/webstore/d...giikdkpmcpkaon
    Thanks
    I have all my photos backed up, does that work for other people browsing the forums to see my photos in threads?
    Using Tapatalk

  11. #11
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    If you give me a thread link that you are having problems seeing the photos I will let you know if it works for me.

  12. #12
    Join Date
    Dec 2013
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    Default

    Quote Originally Posted by Com_VC View Post
    If you give me a thread link that you are having problems seeing the photos I will let you know if it works for me.
    The photo at the bottom of this thread doesn't show up

    //metalworkforums.com/f65/t1219...te-12x36-lathe
    Using Tapatalk

  13. #13
    Join Date
    Aug 2006
    Location
    Melbourne
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    Default

    There is a photo in the first post that works, but no photos in the other posts.

    http://i990.photobucket.com/albums/a...=1523170391978

  14. #14
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    Dec 2013
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    Default

    Quote Originally Posted by bob ward View Post
    Wonderful info Dave J, many thanks.
    Just to add, once the table and top part of the saddle if off with an engine crane, the bottom is easily lifted by hand after removing the nut/or lead screw and Gib.
    Using Tapatalk

  15. #15
    Join Date
    Feb 2013
    Location
    Laidley, SE Qld
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    1,038

    Default That was straightforward but.....

    I followed Dave J's suggestion and lifted the table and swivel off as one to expose the Y axis.
    IMG_1359.jpg

    Removing the gib and sliding the Y axis well forward reveals swarf that has got past the wipers. I suspect the swarf was balling up and jamming the Y slide, the slide only has 2mm clearance over where the swarf is. This is a 10 year old mill so maybe that collection of swarf isn't too bad for that period of time. I cleaned everything and reassembled the Y slide and it all works as well as it used to.
    IMG_1363.jpg

    BUT. From new, Y axis travel has always been a little stiff at the hand wheel end, I was hoping to solve that annoyance while sorting out the serious jamming. Making sure that the screw (28 x 4 trapezoidal) and nut were scrupulously clean I ran the nut on from the LH end and encountered resistance near the RH end, the hand wheel end. W T F? The screw is dead straight, all I can think is that the thread is out of spec at the end. Any thoughts or experience?
    IMG_1365.jpg

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