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Thread: First oval turning

  1. #1
    Join Date
    Sep 2007
    Posts
    613

    First oval turning

    Started yesterday with the first try out to create oval shapes.
    After searching for the right gripping point of the tool, I found the shape in the middle of picture 1000049 acceptable, the device was running with a speed of 733rpm.
    Today the first real try out to make a oval shape 180mm x 155mm, running this time with a speed of 430rpm. See picture 1000057.
    You can see the completed oval turning device running with a speed of 733rpm, on youtube, http://nl.youtube.com/adecrom


    Cheers, and thanks for looking
    Ad
    Attached Thumbnails Attached Thumbnails 100_0049 - try out ovals.jpg   100_0052 - 733 rpm.jpg   100_0057 - first turning oval shape.jpg  
    Last edited by Ad de Crom; 05-02-2008 at 01:41 PM.

  2. #2
    Join Date
    Dec 2007
    Location
    Los Angeles, CA
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    2,668
    Hi Ad, looks very interesting. I was not able to open the link though.

  3. #3
    Join Date
    Sep 2007
    Posts
    613
    Quote Originally Posted by Mohammad Madha View Post
    Hi Ad, looks very interesting. I was not able to open the link though.
    Now you can Mohammad, I did something wrong.
    Ad

  4. #4
    Join Date
    Dec 2006
    Location
    Goodland, Kansas
    Posts
    4,834
    Ad I have to say that looks very interesting. Link worked for me.
    Bernie W.

    Retirement: Thats when you return from work one day
    and say, Hi, Honey, Im home forever.

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  5. #5
    Join Date
    Dec 2007
    Location
    Los Angeles, CA
    Posts
    2,668
    Thanks Ad, It worked for me now.

  6. #6
    Join Date
    Oct 2006
    Location
    ABQ NM
    Posts
    30,014
    I don't know what is more impressive. The fact that you can turn an oval object, or the fact that you designed and built the device to do it.
    Very cool, Ad.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  7. #7
    Join Date
    Oct 2006
    Location
    Tokyo Japan
    Posts
    15,807
    This certainly is a long process, but it is also very interesting Ad, thanks for keeping us updated!
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  8. #8
    Join Date
    Sep 2007
    Posts
    613

    First try to turn something real

    Spend the whole last week with doing refining work.
    This was needed to reduce margins, in different connection points, and rollerchains.
    Made a more sturdy connection between the swivelarm and the rockin headstock, complete with new linear bearings and 10mm steel rods.
    Reduced by doing this the margins with 90%.
    Having to much margins in the mechanical parts, have a negative effect on the oval you try to turn, I noticed this already with the first test run.
    Anyway after all this refining work time for trying to do some real turning.
    I had in my mind to turn a low profile bowl 30mm in hight, hollowed on the inside. For that I had a rectangular piece of oak glued on a round piece of wood, and fasten on the faceplate with 4 screws.
    As it is a new learning process, and there is not much information about this issue available, I decided to use a parting tool and a cutter/scraper tool.
    Turning the outside is not so difficult, but the hollowing job on the inside is not so easy, for sure not in the center area. It's something like a ride on the back of a jumping horse. Running with a speed of 600rpm a bit scary.
    So I created little hills in the center area, which I could flatten with the scraper tool. I found out very soon that it was better to drill or turn first a hole in the center area, before I started with the hollowing job. I was able to reach a depth of about 15mm, not enough, but I saw a couple of other points in the mechanism who needs my attention, so I'm going to work to solve this, before I continue with my turnings.
    For now some pictures of the refining work and the turning results till now.
    At last you can talk about turning an ellipse or an oval. An ellipse is a mathematical shape, an oval a more free style shape, the last is what I'm trying to turn.

    Cheers. Ad (still in one piece)
    Attached Thumbnails Attached Thumbnails 100_0058.jpg   100_0059.jpg   100_0070.jpg   100_0071.jpg  

  9. #9
    Join Date
    Oct 2006
    Location
    ABQ NM
    Posts
    30,014
    Glad to see you survived the test drive in one piece. I'm still amazed each time I see your machine. I could not imagine designing something like that. Very cool.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  10. #10
    Join Date
    Sep 2007
    Posts
    613

    Turning results after a lot of refining work

    Did the last couple of weeks a lot of refining work on the oval turning device.
    All my hard work paid off, in a nice oval shape I turned this afternoon.
    Figured out that it's not possible to use a bowl gouge in the first place, only possible to use a gouge when I reach almost the oval shape.
    Using scrapers and a parting tool is the best you can do.
    Also I think to develop profiled scrapers, for finishing surfaces.
    This is something I saw with visiting the site of the Old Schwamb Mill, furter is not much information available about this issue, so I have to figure it out by myself, as it is a complete new kind of turning, anyway for me.
    Next I'm going to try to turn something usable.
    For now a few pictures to show the last turning results.
    Thanks for looking, comments are very wellcome.
    Cheers. Ad
    Attached Thumbnails Attached Thumbnails 100_0088 - oval turning after refining work.jpg   100_0089 - oval turning after refining work - gripping point 5 mm above equator.jpg   100_0090 - turning result after refining work.jpg  

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