| 摘要 |
An improvement to a drill bit sharpening apparatus in the form of a simple spacer that provides the space setting between a drill bit point and the surface of a grinding device. The spacer comprises an elongated strip made of hard material; the width of the strip is not uniform and diminishes at two portions of the strip. The slanting angle of the portions corresponds to the Z-distances travelled by a drill bit supporting member so as to accomplish the setting. The strip also has calibration marks on its surface corresponding to a set of drill bit diameters for a given point angle. The spacer completely replaces the disc shaped and rectangular shaped prior art spacers.
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