Cool Solution for a Hot Hollow Chisel
My mortiser’s hollow-chisel bit always heats up and burns the wood, even though I keep it sharp and clean. What can I do to avoid this?
Mitch Barnett, Columbus, MS
I’ve seen this happen a lot while teaching woodworking classes. The problem with hollow-chisel bits is that the inside of the chisel is a little rough, so the chips don’t flow through easily, which increases friction and heat. The remedy is to polish this inner surface by making a little drill-mounted flap sander, a trick I learned from Will Neptune. You’ll need a dowel that’s 3 in. long and thin enough to get inside the chisel. With a handsaw, cut a thin kerf about halfway down its length and chuck the other end into a portable drill. Slip a small piece of P220- or P320-grit wet-or-dry sandpaper through the kerf and wrap it around the dowel. Insert…