Materials for a 12 arch rainbow:
- A 14" x 7 1/2" piece of hardwood, about 2 1/2" thick. Oak, Elm or Sycamore are some suitable options.
- A drawing compass.
- A Bandsaw. I asked my dad if a jigsaw could be used if one didn't have access to a bandsaw. He said that jigsaws typically wouldn't be powerful enough to make smooth cuts through such a thick piece of wood - the blade would bend and result in a slanted cut.
- Sanding equipment. I used an Oscillating Spindle Sander and a Belt Sander, but plain old sandpaper will accomplish the same thing, just a lot more slowly.
- Craft paintbrush.
- Non-toxic liquid paints such as liquid watercolors.
- Beeswax Polish. I purchased mine here.
Safety: Wear safety goggles and proper ear protection when using the bandsaw and sanders. Make sure they are in proper working order to ensure safe use.
Step 1. Use the drawing compass to draw a template of the arches on your wood.
Mark where the midpoint of the bottom of your board is.
Place the point of the compass on the midpoint and draw a semi-circle with a 1" radius.
Keeping the compass on the midpoint, increase the distance 1/2" at a time and draw a series of arcs, 12 total.
- Cut away the outside portion first.
- Go slowly and steadily for smooth cuts.
- Instead of simply pushing the wood through the blade, think of yourself as rotating the wood around the blade. This will help your cuts be smooth and your arches be uniform.
- Start with the largest arch and work your way down to the smallest arch.
- If using power sanders, gently and evenly rotate the arches along the sander.
- Use a table belt sander to sand the outside of each arch.
- Use an oscillating spindle sander to sand the inside of each arch.
- If using sandpaper
- Start with the coarsest grit (60) and sand all surfaces of the arches.
- Use progressively finer grit (higher number) sandpaper on all the arches up to at least 220 grit.
- Wipe the sawdust off the arches
- If I had more time and more know how, I would have attempted to dye the arches using natural substances (e.g. berries, roots, etc.). I found some interesting tidbits about dyeing wood online, but decided to go the easy route and use paint in the interest of actually finishing this project!
- I wanted the wood grain to show through the paint, so I thinned it a bit with water before applying it to the wood. I applied paint and let it dry, then applied more layers as needed to get the look I wanted. Because I allowed the grain to show through the colors were somewhat muted, but I liked the end result. Using more opaque paint would ensure brighter colors.
- Apply beeswax with a soft cloth, working it into the wood.
- Let dry.
- Apply additional coats as desired
- To maintain your arches, periodically reapply beeswax.