Manu engineering works has introduced drill grinders. They have capacities ranging from 3 mm to 40 mm [ for model dg 40] and from 5 mm to 50 mm [ for model dg 50]. These are useful in precision grinding and sharpening of all shank type cutting tools such as standard drills, slot drills, core drills, counter shank drills, multi step drills and taps used in machine shops. They can quickly grind conventional points completely in one operation giving repeatable results. The precision 6-jaws, self-centering chuck takes drills from 3 mm to 40 mm dia in model dg 40, and 5 mm to 50 mm in model dg 50. The main chuck spindle consists of frictionless linear bearings having spring loaded precision imported roller thrust bearings on both sides for smooth operation of the workhead for a long period. As the drill rotates, both the lips are ground in one operation uniformly producing the correct cutting angle and precision points. The workhead is set on a robust compound slide. It requires 1 hp, 3-phase, 440 v ac electric motor. This specially designed motor has three heavy-duty ball bearings with dynamically balanced rotor for smooth and vibration free grinding finish for long life. By locking the swiveling workhead at the required angle, the point angle can be varied from 40 to 180. For web-thinning, a separate disc wheel is provided behind the standard wheel for point thinning, immediately after the point grinding without removing the drill.
