| 摘要 |
<p>A grinding device for grinding a channel in a conical aperture 19, comprises: a tubular head 14 having an axis which is oriented to define the grinding direction and which receives a high speed rotatable grinding tool shaft 18; and reciprocable drive means 15, operable to reciprocate a pivoted link 16 thereby to rotate the head 14 through a predetermined limited angle about its axis, the head 14 and the grinding tool shaft 18 being 50 coupled together that when the drive means 15, 16 operates, the consequent rotation of the head 14 will cause the grinding tool 18 to advance to execute a grinding stroke. <IMAGE></p> |
