The next step in this woodworking project is simple, but a bit tricky. You'll notice there are nodes about every twelve to sixteen inches along the length of the bamboo pieces. The area inside the tubes is hollow in between these nodes, but enclosed at the node. To achieve sound, we'll need to hollow out the nodes.
The best way I've found to do this is with a 1" paddle bit and a 12" extension, available at any home center. Use the paddle bit without the extension for every node that is less than six inches from the end of the tube. Simply hold the bamboo securely and drill out the node.
When needing to cut deeper nodes, use the extension. Try to center the bit as best you can on deep nodes.
TIP: Paddle bits can grab and twist stock right out of your hand, so hold the bamboo securely on your work table and drill slowly. If the bit grabs, stop, secure the bamboo again and proceed slowly. The nodes will drill out very easily in only a few seconds each.


