|Project by SPalm||posted 07-01-2012 11:48 PM||4375 views||10 times favorited||46 comments|
I made another shell box with my homemade CNC, but this time I spent a lot of energy with the shell design itself. I really like the African Rosewood that I had used before. It routes like a dream, and has a grain and color that goes with the shell motif. I have a board that is about 5.5 inches wide, and just over an inch thick – so that determined the size. I was off to Google Images to find pictures of shells.
Once I found one that I liked, I imported it into my CAD system, and sized the picture to match my wood. Then I drew on top of the picture – on different layers, and using vectors. I soon discovered that the shell has two circle center points. The profile of the shell is a circle centered in the shell, while the rays were centered at the bottom. Maybe a Duh for everyone else, but if you look at my previous shells, I only had one center point. I just don’t see it unless someone bops me on the head.
Then came the artist’s implementation stuff. It looked so much better if the left half exactly matched the right half, if the rays or grooves were spread equally and had a slight curve, and the hinge box size was reduced. So the end result is close – well close enough. I really like it.
The top is half inch thick, and the bottom is a full inch. It is finished with shellac, oil, and then wax. The inside of the hinge box was squared up with a chisel, and the hinge pin is a bamboo skewer.
Oh – self promotion: Vectric is the maker of the CAD/CAM system that I use. They are an English company with a worldwide reach. They just did a ‘Case Study’ of me for their quarterly news letter. Yikes. http://www.vectric.com/WebSite/Vectric/vcp/vcp_case_spalm.html
-- -- I'm no rocket surgeon