| 摘要 |
PURPOSE: A drill jig of controlling depth is provided to visually confirm range of a drill bit for inserting into a base material when the drill bit perforates the base material by fixing a circular pipe on a cutting unit of the drill bit. CONSTITUTION: A drill jig of controlling depth comprises a circular pipe(10), a wrench bolt(20), and a wing unit(30). The circular pipe is penetrated into a cutting unit of a drill bit(D). The wrench bolt is penetrated into the circular pipe and fixes the position of the circular pipe by pressing the outer surface of the cutting unit. A plurality of wing units is installed to the outer surface of the circular pipe in a constant interval and scatters a cutting material ascended along a chip groove into the periphery of the drill bit.
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