3/22/2023 0 Comments Deltacad student![]() I have added two breasthooks (red) for the sheer chine join (i.e. The reason for this is to minimise the measurements required to loft the design: ![]() I have re-edited the cut-out design to align most points with 100 mm spacing. Just have to decide what I want it to look like before designing it. write a macro to generate) a set of text offsets for marking out the shapes on the plywood (the black box in the image above). What is now remaining is to generate (i.e. Below is the cutout design on a single sheet of 4 mm marine plywood: Okay, I have generated the pontoon design file in DeltaCad, what next? No big deal, digitise "shapes" over the pieces I want (delete the all the segments when done) and lay them out. Shown below is “Heart’s Desire II” a design by William Atkin. The program is capable of more complex designs but the offset table entry process is rather time consuming. For example the following options, shown below, also draw a series of cross-sections, long sections and plan slices. The other option entries, create different sections (cross, long and plan) through the model. If the “Frames” entry is set to zero then the offset table as entered in Excel will be drawn as below. This option adds additional frames to the hull model. Set the number of frames to 7 and zero the remaining entries as shown below. The macro then presents the “Hull Sections” options box. For the “Mini-Kayak” it is called “Mini-Kayak.CSV”, as shown below. where the Excel file is located) and select and okay the CSV file. You will need to navigate to your working directory (i.e. It starts in the DeltaCad macro directory. When you run the DeltaCad macro, it first presents a file manager window. Note: The unfolded panels are the cut-outs for the design and only one side is shown. Below is the imported and unfolded “Mini-Kayak” showing the main drawing components. For complex designs, the actual process is iterative (i.e. In DeltaCad the macro (“BoatOffsetTable.bas”) is run to import the CSV file and draw the design. To execute the macro just click the blue “Make CSV” arrow as shown above. The name of the CSV file is the same as the Excel WorkSheet name. The offset table is exported to DeltaCad as a CSV file. ![]() No curvature checks are made, the design may not be developable (i.e.If an interpolated value appears wrong or wildly off then you will need to add “breaks” to the chine stations near the problem area.Stations within 5 mm of each other will have “breaks” automatically added.The stations are rounded to the nearest millimetre.Chines can have a “break” or a sharp bend.Chines can be invisible (and ignored) if the colour is “0”.Chines have a colour for easy identification.The above offset table has three additional features over an offset table: The actual design is too small to be of practical use as a Kayak (refer to Anderson’s webpage). “Mini-Kayak” is an adaptation of work by Bruce C. Below is the Excel offset table for the “Mini-Kayak”. WorkflowĭeltaCad does not have a suitable table entry process which is why Excel is used. Note: DeltaCad can be purchased for US$40 from. The DeltaCad macro imports the CSV, draws the design and unfolds (develops) the hull. The Excel file and macro allow you to enter the offset table and then to export the design to a CSV file for DeltaCad. The process consists of two macros/files: ![]() The new DeltaCad macro version handles simple hulls easily and the more complex designs are slow but doable. Why migrate from the spreadsheet version previously presented? After all it works! The reason is that even simple designs take forever to code and it is just too hard for more complex projects. Asking the macro to sort out lazy chine offsets was a dead end. The issue is that the underlying processes (wire-framing) is not unique/deterministic. All I can say it was a bit of a marathon getting the code working reliably. ![]()
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