| 摘要 |
A sine generator drill head (41) comprising an outer housing (12), a spindle (30) having an axis, including a first motor (102) driving a vibratory mechanism (69) for providing vibratory movement to said spindle, and a second motor (54) for providing rotational movement to said spindle, said vibratory mechanism includes at least two rotating eccentric masses (70, 74) characterized in that the rotation of one of said masses (70) is drivingly engaged with the other of said masses (74) to rotate it in an opposite direction.
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