What is a "clogged" bit?
When drilling into wood with a wood drill bit, the threaded tip pulls the bit effortlessly into the wood. If, after a few millimeters of drilling, the bit no longer descends into the hole but remains at the same height, the bit is said to be “clogged.”
During the drilling process, small pieces of wood get stuck in the groove under the pre-cutter. As soon as the wood exceeds the height of the knife (red line on picture 3), it prevents the knife from cutting and the drill bit can no longer drill. It stops, and friction heats up the drill bit and the wood. The drill bit becomes “clogged.”
To prevent this, Bonnet & Fils produces drill bits with a wider groove, the shape of which helps clear chips during drilling. A deeper thread depth at the tip also helps the drill bit sink into the wood.