Beginner's Guide to CNC Machining in Wood by Ralph Bagnall

Author:Ralph Bagnall
Language: eng
Format: epub
Publisher: Fox Chapel Publishing

Fig. 7: The sign after the CNC work is completed. It only needs to be separated from the excess by cutting the tabs and lightly sanded.

9. With all of the lettering programmed, the sign can be cut out. This requires a second G-code program because a straight bit is needed. If your sign outline is a simple shape, you can use whichever straight bit you wish, but in this case, the border will require a smaller-diameter bit to show all the detail. A larger diameter bit will not be able to fit into the smaller details, especially at the top and the lower right corner. In the end, I chose a 60° V-bit to cut the lettering and a 3/16″ (4mm) straight bit to cut the sign out; this worked quite well.

10. A sign of this style can show the wood grain and have the letters and other carvings painted. I have found that applying a couple coats of shellac or other topcoat to the surface just before carving allows for easier painting of the carvings afterward. The V-bit cuts through the topcoat, so paints or stains applied to the carvings will not bleed into the wood, and you can easily sand off the excess. The finished sign was stained first, then the letters were carved through the stain, and then the entire sign was given a clear finish. This gives the opposite effect but is very easy to do successfully.

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