Millers Falls No.2 Eggbeater Drill Type Study
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Type K5 Spindle Nose & Chuck

The Type K5's new, three-jaw chuck is an improvement over the older two-jaw chuck, because the three jaws theoretically center the bit much more accurately than the two-jaw version did. The two-jaw chuck depended on a narrow Vee groove in the middle of each jaw to center the bit, and that was more effective for small drills than for larger ones. The patent date on this chuck is September 29, 1896. Similarly to the two-jaw version, each jaw is flat on the sides and is guided by grooves in the body of the chuck. There are no springs, so one has to wiggle the bit during insertion to move the jaws out of the way.