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Step 13Make concave cut in base for chair body
As described in the 2 previous steps the concave surface of the base holds the ball. At the 8 inch mark begin making these cuts in addition to the outer cuts.
Compared to the cuts up to this point these are difficult to make cleanly. The first layers cut with the concave arm are very shallow. When using thicker material the blade won't go all the way through the cardboard and will leave exposed corrugated layers. Using 1/8 inch cardboard is preferable to the thicker material but will take more time to finish.
I used 1/2 inch cardboard to build height as quick as possible. The concave surface was so jagged and irregular it needed to be cleaned up. I attached a small router to the cutter arm with hose clamps. A wide, flat bit helped to clean up the surface, and the inevitable paper-mache layers covered the rest of the imperfections. A router or RotoZip instead of a blade may be a better solution.
Finish the completed base with 2 or 3 layers of paper-mache and you're done with construction.
Next stop, finishing.
Compared to the cuts up to this point these are difficult to make cleanly. The first layers cut with the concave arm are very shallow. When using thicker material the blade won't go all the way through the cardboard and will leave exposed corrugated layers. Using 1/8 inch cardboard is preferable to the thicker material but will take more time to finish.
I used 1/2 inch cardboard to build height as quick as possible. The concave surface was so jagged and irregular it needed to be cleaned up. I attached a small router to the cutter arm with hose clamps. A wide, flat bit helped to clean up the surface, and the inevitable paper-mache layers covered the rest of the imperfections. A router or RotoZip instead of a blade may be a better solution.
Finish the completed base with 2 or 3 layers of paper-mache and you're done with construction.
Next stop, finishing.
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