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PeterT_au1-Visitor
1-Visitor
June 9, 2015
Question

Flat Pattern of a rounded part

  • June 9, 2015
  • 4 replies
  • 5332 views

‌Hi, we have drawn a design for a stool, it starts as a truncated cone Upside down,  we cannot seem to turn the 3D part into a sheet material version to create a flat pattern.  Needed so we can construct it from Bendy Ply.  Does anyone know of any tutorials of demos around similar work?

    4 replies

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    PeterSach1-Visitor
    1-Visitor
    June 10, 2015

    Hi- Try this link

    www.youtube.com/watch?v=6uyym5S2Gmc


    Let me know  how you get on!


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    tbrotherhood12-Amethyst
    12-Amethyst
    June 10, 2015

    Hi Peter,

    The video you linked works although it leaves a gap in the conical surface.

    The sketch rip I described is the elegant solution.

    A little while ago I helped an A level student who wanted aboriginal art on the outer surface of cylinder for wind chimes.It was tricky. We ended up with a tube in a tube. The outer tube was ripped in the method outlined. The flattened metal tube had the pattern applied then bent back. The inner tube was to se the depth of cut. The two assembled tubes were set up on a rotary axis on the mill for machining.

    IMG_3044 (Copy).JPG

    IMG_3046 (Copy).JPG

    Cheers

    Tim

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    tbrotherhood12-Amethyst
    12-Amethyst
    June 10, 2015

    The trick is using a sketch line to rip the surface to allow it to flatten.  I created a model which is attached.

    1. I revolved the shape then shelled, removing top and bottom.
    2. On the outer surface I created a tangential datum plane then sketch a line down the outside of the shape.
    3. The shape was converted to sheet metal model.
    4. A sketched rip selected the line which cut the cone.
    5. The flat pattern was applied resulting in a net for cutting.

    Trunc_cone.jpg

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    PeterT_au1-VisitorAuthor
    1-Visitor
    June 10, 2015

    Thanks Peter and Tim, I wish it was so simple, part attached...

    I will try your methods tomorrow, however.  We tried sketch rip, but as you will see there is no flat surface in my clients model (yes Tim, its Ruth)

    Thanks for the support.

    T
    tbrotherhood12-Amethyst
    12-Amethyst
    June 10, 2015

    Ooooh!  This is tricky...trying all sorts and nothing has worked so far...

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    PeterT_au1-VisitorAuthor
    1-Visitor
    June 10, 2015

    ‌Thanks gents, nice to see your problem solving processes are identical to what we tried... and had the same errors, eg varying thickness, all seems to work but flat pattern does not show.  I also surface modelled and thickened to get the shape.

    It is now an intellectual exercise. Ruth found the old Technical drawing equipment and did the triangulation to draw a full size half pattern.  We will post a photo of the fungi stool when finished.   Thanks for your time, support and collegiality.

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    tbrotherhood12-Amethyst
    12-Amethyst
    June 11, 2015

    Always happy to help, it keeps my brain active in advancing years.

    Looking forward to seeing the finished stool.

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    PeterT_au1-VisitorAuthor
    1-Visitor
    July 5, 2015

    ‌OK, to get a complex part ripped and developed  to a pattern, I did surface rips and removed difficult sections, flat pattt\erned it, saved as.

    Then opened original and removed other sections, repeated.  It took 3 goes but could then assemble the various flat patterns to get what we needed.  The MAKER had already used some old technical drawing gear to do the task while I fiddled, but we know we can do it next time.  I will post a photo of the Mushroom(actually a CACTUS called Lithop) stool.  Thank you all for the effort and your time.

    PeterT

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    PeterSach1-Visitor
    1-Visitor
    July 6, 2015

    Will look out for that

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