Earlier today, I came across new spade bits with an interesting feature: threaded tips. According to Bosch — one of several self-feeding bit manufacturers — the “tip is threaded like a wood screw and literally pulls the bit through the wood for fast cutting action.” Bosch also claims that these bits are kind on your arms since the pulling action reduces the amount of pressure required to drill large holes.
If these bits work as claimed, then they might make life easier for those who routinely use spades in a portable drill.
But I’m eager to see what you have to say. Do these self-feeding bits excite you, or are they just boring?