| 摘要 |
A ball nose end mill includes a holder body with a first half and a second half of a tip end thereof divided by a slot, a plate-shaped insert in the slot, a clamp screw with a screw shaft screwed into the second half and a screw head bearing against the first half, a tapered ring fitted around the screw shaft and seated in a tapered hole in the insert, and a spring between the screw head and the tapered ring pressing the ring against the insert. The insert is firmly pressed against the bottom of the slot, and the screw is frictionally secured.
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