I've been having a lot fun with the counter block it's not as straightforward as it looks.
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Firstly the top surface follows the contour of the deck and the angled back is straight along the bottom and curved at the top. The block provided is half inch thick and needs a sixteenth taken off it.
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I wanted to try a few ideas for the best way to make this part so I used an offcut that was the same thickness to experiment with. This is how I drilled the 5° hole, it was drilled before cutting the angle at the back.
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As I had no easy way of cutting the thickness down I cut slots in the block for the stern frames.
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I made this saw around 30 years ago, it's the first time I've used it for a project. I have a number of milling cutters of different thickness I can use with it but I will need to get a proper saw blade.
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This is the trap that caught me out, I lined up the stern frame 3 with bulkhead R and cut a slot on a 10° angle. It was only when I had all the stern frames in place I could see it was wrong as the top of frame 3 was hitting frame 2. Checking the drawing I could see that stern frame 3 starts at 10° and finishes at 5°. I was able to change the angle and blend in the transition, all the sides of this frame have to be beveled to match the other surfaces.
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This is how it finished up I was using a dowel to hold it in position while working on the other parts.
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In the end I was quite happy with the experimental part so I decided to keep it.