can someone please flatten

Discussion in 'Software' started by Guest62110524, Apr 14, 2009.

  1. Guest62110524

    Guest62110524 Previous Member

    can someone please flatten
    I have taken from R4 TO MAXSURF but it will not flatten, squish makes nonsense of it
     
    Last edited: Jun 21, 2010
  2. Guest625101138

    Guest625101138 Previous Member

    When I load it to Delftship there is something screwed up in the detail at the bow. I have attached the curvature plot. The plate is shown bottom up. The detail could be fixed up but it looks like there is some notching for some connection??

    Apart from this detail the plate should be developable as the curvature is not particularly tortured elsewhere.

    Rick W
     

    Attached Files:

  3. Guest62110524

    Guest62110524 Previous Member

    thanks can you email that to my email addrsss(not here) so I can have a look in Rhino 4
    was not aware delftship could do thsi, do you have pro vs?
    cheers
     
  4. Guest625101138

    Guest625101138 Previous Member

    Stu
    I have Delftship pro. (I was using it so much that I thought it only reasonable to make a contribution.)

    I only loaded your igs file. I have not made any corrections yet. I tried to sort out the problem but I keep making a hole in the plate that I have not been able to repair.

    I have attached a dxf file simply generated from your igs. Not sure if this still has the overlapping surfaces as I cannot access a control net in dxf.

    If I persevered I expect I could fix the plate. Let me know if you want me to work on it for a bit.

    Rick W
     

    Attached Files:

  5. gwboats
    Joined: Sep 2005
    Posts: 109
    Likes: 11, Points: 28, Legacy Rep: 77
    Location: UK

    gwboats Naval Architect

    Plate development

    Try turning on Control Points in Rhino and I think you will see your problem at the forefoot!

    The mesh needs to be much simpler in this area.

    Cheers,
    Graham Westbrook
     

    Attached Files:

    • Net.jpg
      Net.jpg
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  6. Guest62110524

    Guest62110524 Previous Member

    thanks men, I have dfx the yacht was built in Multisurf, at this stage I am just trying work out plate needs
    I can not post much more because of copywrite,
    I am not a cat builder,this will be my first---- must admit I like this one, well designed by Bloomefield Start build in about 3 months
     
    Last edited: Jun 21, 2010
  7. Guest62110524

    Guest62110524 Previous Member

    my partner in this(bh nautika) used diff input in maxsurf, so managed to flatten, said there were indeed something odd in forefoot,
    anyways there will have to be a seam in the thing as there is considerable compound, you can stretch form most up to 600mm wide, this section is 1200plus , ah well, done it many times before
     
    Last edited: Jun 21, 2010
  8. Guest62110524

    Guest62110524 Previous Member

    here tis in workshop
    I do not understand why they say(strain) as after it is stretched and formed it,ll fall on I will put two butts and one seam in it though to manage it in the wheels
     
    Last edited: Jun 21, 2010
  9. Andrew Mason
    Joined: Mar 2003
    Posts: 397
    Likes: 18, Points: 18, Legacy Rep: 206
    Location: Perth, Western Australia

    Andrew Mason Senior Member

    It looks like you have a very large amount of strain within a very small portion of the plate, however this could just local ripples in the surface caused by a few bad control points and not affect the overall plate shape. It would be worth trying to clean the surface up in the area shaded blue.
     
    Last edited: Apr 23, 2009
  10. Humberto
    Joined: Mar 2008
    Posts: 47
    Likes: 2, Points: 0, Legacy Rep: 55
    Location: Spain

    Humberto Junior Member

    Actually is not a problem of simplicity. I have imported and activated column view only in jSDN and this is what you get (attached pictures). The problem is that control point column 24 is placed forward than column 25 (and 26, 27, etc). This produces a singularity there (which is shown in the Gaussian plot). A solution may be just simply removing control point column 24.

    I hope this helps.

    Humberto Martinez
     

    Attached Files:

  11. Guest62110524

    Guest62110524 Previous Member

    thanks both, I will build it a little over size anyway and scribe it down to the keel and above plate lines On this particular plate I just wanted a near enough shape as when I stretch this and form it, if it were cut to workshop, and my forming was not (in line) in would not be exact anyways
    Aluminium is very forgiving, if you make shape in the plate very close, you can pull it around and down to lines easlly Some of the boats I plate have 48 plates, ,
    When I made the change from steel way back I was staggered at the props of al al
    I am not a CAD man these were the surfaces as supplied
     
  12. daiquiri
    Joined: May 2004
    Posts: 5,373
    Likes: 255, Points: 93, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Yes, aluminum is very forgiving, but wouldn't it be better to eliminate this problem at the root (i.e. at design stage), rather than oversizing, cutting, hammering etc the sheets to make them look smooth?
    This is clearly a design error, all you need is to get back to the designer and tell him there are some mis-aligned control points. He might then send you back a correct (and developable) hull model.
     

  13. daiquiri
    Joined: May 2004
    Posts: 5,373
    Likes: 255, Points: 93, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Yes, aluminum is very forgiving, but wouldn't it be better to eliminate this problem at the root (i.e. at design stage), rather than oversizing, cutting, hammering etc the sheets to make them look smooth?
    ll you need is to get back to the designer and tell him there are some badly aligned control points. You will make him a favour too, because this stuff has also probably led to a wrong shaping of ribs, girders, bulkheads etc. He will then send you back a correct (and developable) hull model.
     
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