| 摘要 |
In a milling machine, a quill power feed mechanism is provided an adjustable overload slip clutch capable of feeding the quill completely to a pre-set micrometer quill stop during a drilling or boring operation. The improved slip clutch includes an overload housing which is attached to a driven gear freely rotatable about a quill pinion shaft, and a clutch body attached to the quill pinion shaft. The overload housing has a smooth internal clutch face which interfaces with a corresponding smooth outer clutch face on the clutch body to drive the quill pinion shaft. The force with which the clutch body is passed against the smooth internal clutch face is adjustable to vary the resistance torque on the quill pinion shaft at which the interacting clutch faces will slip and allow the overload housing to rotate independently of the clutch body.
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