Tuesday, May 8, 2007
My Favorite Grind
Here is a close up photo of the grind that I use on my drill bits. I'll be showing how to grind it soon. The picture below it is of the bit while spinning. It brings up an important issue. Every bit and every chuck have some degree of runout, they don't spin perfectly. When chucking up a bit, try spinning it at high speed and look at the point. If it moves erratically, try loosening the chuck and shifting the bit a quarter turn. When you have the bit in the optimum position, the runout in the bit and the runout in the chuck will cancel each other out almost completely. I made a mark on the chuck of my drill and every time that I use a new bit, I make a corresponding mark on the bit once it spins true, then when I go to use the bit, it is as simple as lining up the marks.