Present a method of sharpening twist drills in the interior conical surface and exterior conical surface grinding wheel. A novel sharpeningdevice of linkage-gear compound mechanism is designed.
提出了利用外锥面砂轮实现内锥面刃磨钻头的方法，设计了实现该方法的连杆齿轮组合机构。
2
The structure, principle and application of a simple centring device used for the sharpening of hob cutters are described.
介绍了用于刃磨齿轮滚刀的简易对中装置的结构、原理及使用方法。
3
He bought a device for sharpening old razor blades.