Inspection of the twist drill bits

After regrinding the point and web thinning of the twist drills, it is important to visually inspect the drill bits. The following points need to check

1:  The point surfaces are ground smoothly.

2:  The cutting lips have no burn marks and have clean sharp edge

3:  The web is in the center of the drill; equal portions have been removed from each side

4:  The chisel-edge angle is correct

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