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Lines and Patterns


By micahsimmons - Posted on 29 January 2012

plottingThis is the half breadths of the body plan; the vertical line in the center is the stem of the boat, and each of the lines next to it are the profiles of the frames, or ribs of the boat, which double as the molds that the planks will be bent around.  I laid these out on half a sheet of masonite with a colored pencil, plotting points from the table of offsets.  These are the lines that I'll use to make the patterns for the frames and transom, and it looks to me like I won't know whether I hosed the job up or not until I'm putting the planks on the boat, which will be much too late. 

Once the lines were down, I laid the masonite on the floor and for each station, put nails on their sides at each plotted point, and then laid a piece of pattern stock on top of it and stepped on it, transferring the points to the pattern stock. 

From that, I made a pattern for each frame and the transom.  I used the patterns to lay out the frames on the oak frame stock, and then sawed out and assembled the frames with plywood gussets at the joints in the frames. 

man sawing

gusset

frame parts

When I had the frames assembled, I lined them up on the shop floor to take a picture, and saw that I'd assembled frame #3 inside out, with the sheer and garboard reversed. 

skeleton

Since I'd glued and screwed the gussets, there was no saving anything from that but the screws, so into the stove it went, and I started making a new frame. 

wood stove

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