Guide To CNC Chuck Jaws: Soft Jaws vs. Hard Jaws
soft jaws are more adaptable but wear out faster, while hard jaws are more durable but less flexible for customizing the fit of the workpiece. ...
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A 6-jaw chuck is a type of lathe chuck designed to hold workpieces more securely and concentrically than 3- or 4-jaw chucks, especially for irregular or thin-walled parts. It features 6 jaws that move simultaneously to clamp the workpiece evenly around its circumference, providing better grip and reduced deformation.
Jaw Movement: All jaws move simultaneously in or out when the chuck key is turned. This is achieved through a scroll plate inside the chuck that has a spiral groove engaging with jaw teeth.
Scroll Plate: The scroll plate rotates when the key is turned, and its spiral groove moves the jaws radially inwards or outwards.
Self-Centering: Because all jaws move together symmetrically, the chuck is self-centering, making it ideal for holding round or hexagonal workpieces with high concentricity.
Jaw Type: Usually, the jaws are internal gripping (holding inside the bore) or external gripping (holding outside diameter), depending on the application.
Material: Typically made from hardened steel for durability and precision.
| Parameter | Typical Range / Example |
|---|---|
| Chuck Diameter | 100 mm to 250 mm (4" to 10") |
| Jaw Stroke | ~10-15 mm (radial movement) |
| Jaw Height | ~20-30 mm |
| Number of Jaws | 6 |
| Mounting Type | Backplate mounting (Bolt circle diameter varies by lathe model) |
| Max Workpiece Diameter | Approximately chuck diameter - jaw thickness (varies) |
| Weight | From ~2 kg to 10+ kg depending on size |
soft jaws are more adaptable but wear out faster, while hard jaws are more durable but less flexible for customizing the fit of the workpiece. ...
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