| 摘要 |
FIELD: process engineering. ^ SUBSTANCE: proposed drill bit comprises body, adjustable element, adjusting plate with side surface to interact with adjustable element, adjusting screw and locking screws for adjustable element and adjusting plate. The latter is arranged to define shift of adjustable element by its thickness while locking screw is arranged in guide slot made in adjusting plate. Note here that adjusting screw has beads and is arranged in adjusting plate slot while adjustable element is fitted to shift relative to its locking screw. ^ EFFECT: higher accuracy. ^ 3 dwg |
