adjustable angular drill jig的用法和样例：
- By designing and making the roll-over drill jig, the processing precision of hole is improved and work intensity is reduced.
- Based on the analysis of drill bush wear,the methods of determining the wear tolerances and lifetime of the drill bush in the design of drilling jig are presented.
- drill jig for pneumatic hammer valve
- In order to meet the requirements for the position of hub hole, the paper introduces the structure principle, operation process and characteristics of simple drilling jig used in the beam drill.