Problem with Tables of Offsets

Discussion in 'Boat Design' started by Proflooney, Dec 26, 2016.

  1. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    So the next question is if I want the bow on the right and stern on the left how does the data need arranged top to bottom in the file to get this

    PS thanks for all the help guys I am slowly starting to understand this better, however i appologize for being so slow to catch on
     
  2. JosephT
    Joined: Jun 2009
    Posts: 500
    Likes: 26, Points: 28, Legacy Rep: 218
    Location: Roaring Forties

    JosephT Senior Member

    I see a couple of problems for starters:

    1. There are definitely some human errors on some of those points you transcribed from the original table. Some points are just out of place, which causes the crumpled paper appearance until you straighten them out.

    2. The points are not entered correctly. Your side & top views appear to be flipped.

    It may be best to import a top, side, bow & stern pic of the hull if you have one and loft a fresh hull based on that. Better yet, if you have a linesplan that would be even better. If all you have is that table it's going to need some fixing.
     
  3. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    well those i set up are for entering into solidworks thats why i asked what format is needed for delftship as i know autocad reverses the stations and waterlines from what solidworks uses.

    I have tried messing with delftship and thats where i get the crumpled paper look. seems their documentation is seriously lacking for someone like me.

    I have the lines drawing sheet traced and saved to dxf format but dont see a way to bring it in to delftship as a dxf and the png files I made for them I get the top and the profile view in but when I try to bring in the stations I get an error and they are saved the same way
     
  4. TANSL
    Joined: Sep 2011
    Posts: 4,353
    Likes: 78, Points: 58, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    No software can "reverse the stations and waterlines". What you should take care of is that the coordinate system is the same in AutoCAD, SolidWorks, or any other drawing system you want to use. Before exporting/importing files in dxf format, or in any format, check the coordinate system of the software that exports or imports the file.
     
  5. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    well I have had some friends that use autocad and when importing curve files the format they say it likes is

    Waterline, Station, Data

    whereas solidworks likes it as

    Station, Waterline, Data

    it is the same info just in a different order

    what I was asking about Delftship is wherther it wants or prefers the order of the curve stations from fore to aft or from aft to fore or does it even matter?
     
  6. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    you had shown the example of the canoe data file. solidworks needs a separate data file for each station whereas autocad you can import it as you showed for the canoe all in one data sheet.

    so I was asking is there a certain order to put the data in the sheet for delftship IE bow station first or aft station first in the list or does it matter. that is the REVERSE order I was asking about
     
  7. kilocharlie2
    Joined: Nov 2016
    Posts: 30
    Likes: 2, Points: 0, Legacy Rep: 35
    Location: Left Coast, North America

    kilocharlie2 Junior Member

    I could have lofted the sucker by the time the computer stops coughing, gol (giggling out loud).

    Try listing each type of data as an array, and run all of them into each position. One of the resulting pix should come out looking like a boat. That one probably has the correct order. if it is too time consuming, try running 1/4 of the data - you should get 1/4 of a boat in one resulting picture - then load the entire set of arrays into that one.
     
  8. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    I got the data figured out sorta. I found a new set of drawings that were really good that was listed similarly and got them all in and such with really good results however I been a week now trying to find the last 2 dimensions. they are in there somewhere but i just cant seem to find the correct ones.

    This one is from the Steam Schooner Wapama. I posted the files in case anyone is interested. http://www.proflooney.net/Steamer-Schooner-Wapama.zip

    I did really good converting the tables i have my excel file in there. however i seem to not be able to find the proper Deck Sheer and Pland Sheer dimensions to finish off my curve files. when I use the ones on the offset table listing its way whacky when I do my curve file.

    the cool part is my buttock and the curves minus the 2 upper dimensions are smack on to the drawings once i rescaled the drawings.

    seems there are 2 sets of drawings 1: the originals and 2: drawings the museum had a ship design company redo and fix when they were planning at one time of refubishing the ship
     
  9. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    Here is a screenshot of the curve files that I have working so far. you will notice they almost line up perfectly. it is just the upper part of the curves that I cant figure out. Also the last 2 curve files seem to be off some so will need to work on those too.
     
  10. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    PS the rabbet lines I tweaked slightly as they were off some like says they are at 10" when they should be at 9"
     
  11. Scot McPherson
    Joined: Jan 2017
    Posts: 103
    Likes: 2, Points: 0, Legacy Rep: 23
    Location: New England

    Scot McPherson Senior Member

    Have you tried drawing the table of offsets onto paper first?

    Draw them on paper, then use a thin batten to fair the lines and take a new set of offsets.

    There's a re vertical lines there. That's all the " means in the rows below the sheer. It means it's the same half width, or in the case of the bottom table, it's the same height as the row above.

    The table to me looks like a boat that's probably just over 60ft LOD and the table was taken with 6 ft offsets. Draw this out on paper, and take up a new table of offsets stationed at 2 ft and I think you'll have a smoother hull shape.
     
  12. Proflooney
    Joined: Nov 2016
    Posts: 66
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: Moline

    Proflooney Junior Member

    thanks I got some help and got them figured out they came out pretty good I was just reading them wrong as I am new to this boat stuff
     

  13. JSL
    Joined: Nov 2012
    Posts: 515
    Likes: 12, Points: 18, Legacy Rep: 41
    Location: Delta BC

    JSL Senior Member

    The offsets on post 1 (Mission boat) look fine. I have worked on Robert Allan designs before and they all follow traditional methods. Seeing the 'Lines' would help.
    This was probably a wood vessel so lots of offsets refinements would be done by the loftsman.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.