A 4-jaw chuck offers independent jaw adjustment for holding non-circular or eccentric workpieces, while a 6-jaw chuck provides self-centering and potentially less deformation when holding round or thin-walled materials. Both types have their strengths, and the best choice depends on the specific application.

4-Jaw Chuck:

  • Independent Jaws: Each jaw moves independently, allowing for precise centering and gripping of irregular shapes and off-center workpieces.
  • Eccentric Turning: This feature makes 4-jaw chucks ideal for turning operations where the workpiece's center of rotation is not the same as its geometric center.
  • Minimal Runout: 4-jaw chucks can achieve very low runout (eccentricity) when properly adjusted, ensuring accurate machining.

6-Jaw Chuck:

  • Self-Centering: The six jaws move in unison, providing a more concentric grip on round or symmetrical workpieces.
  • Reduced Deformation: Spreading the clamping force across six jaws can minimize deformation, especially when working with thin-walled materials.
  • Faster Setup: Self-centering can speed up the workpiece setup process compared to manually adjusting all four jaws in a 4-jaw chuck.

In summary:

  • Choose a 4-jaw chuck for versatility in holding non-round parts, achieving minimal runout, and performing eccentric turning.
  • Choose a 6-jaw chuck for holding round or thin-walled materials, where concentricity and reduced deformation are crucial.
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