| 摘要 |
PURPOSE:To attach and detach various kinds of drills different in the torsional direction easily and quickly and to grind the drills with high accuracy. CONSTITUTION:A drill grinding apparatus comprises a support rod 14 where a drill 12 is fixed, and a holder 22 where the support rod 14 is inserted, which is adapted to hold the forward edge part of the drill 12 and freely adjust the helix angle of the tip 16 of the drill 12 to the peripheral surface 20 of a disc-like diamond grinding wheel 18, wherein a right hand helix display part 86 and a left hand helix display part 88 are provided on the holder 22. |
