A COMPANION MACHINE TO THE OLIVER DRILL POINTERS TO IMPROVE DRILLING EFFICIENCY
- Thin webs to proper thickness
- Correct webs that are off center
- Correct out of index flutes
- Add chip breakers
The best of drill points lose a lot of their proven advantages if poor web thinning is incorporated in the tool. If the thinning is done by hand and one flute is ground a little deeper than the other, you immediately have a drill point with cutting lips of unequal length. Mechanical web thinning generally is not much faster than hand thinning but it does create equal conditions for both cutting lips of the drill. Thus, the drills perform for a greater length of time and overall thinning operations required during the year are reduced.
The web thickness of a drill increases as the drill is re-sharpened. If the drills are not too badly worn when they come to the cutter grind department for resharpening, you can generally get 3 or 4 resharpenings to each thinning operation. Proper web thinning will reduce the amount of torque required for the drilling job. Also, the reduction in end pressure will cause less damage to the chisel angle area of the drill point.