Mini Lathe Chuck 3-Jaw Chuck and a 4-Jaw  Chuck

The Mini Lathe Chuck Kit combines a 3-Jaw Self-Centering Chuck and a 4-Jaw Independent Chuck, offering versatile workholding for small CNC lathes and benchtop milling machines. Crafted from high-grade tool steel and precision-ground for minimal runout, this kit enables both rapid centering of round stock and precise, independent gripping of irregular shapes. Whether you’re turning dowels or facing off square billets, these chucks deliver secure, repeatable performance.

Components

3-Jaw Chuck

• Diameter: 3″ (80 mm).

• Centering Mechanism: Scroll plate ensures all three jaws move simultaneously for fast workpiece alignment.

• Mounting: Plain back or threaded (3/4″×16 TPI or 1″×8 TPI) compatible with standard mini-lathe spindles.

• Material: High-grade tool steel body with hardened jaws for wear resistance.

• Key & Jaw Sets Included: Comes with inside and outside jaws plus T-key for tightening.

4-Jaw Chuck

• Diameter: 3″ (80 mm) or 4″ (100 mm) options.

• Independent Jaws: Each jaw adjusts separately, allowing off-center work and gripping of square or hex stock.

• Mounting Pattern: Plain back with 4-bolt mounting to mini-lathe spindle plate.

• Material: Case-hardened steel construction for durability.

• Accessories: Chuck key and set of inside/outside jaws included.

Specifications

Key Benefits

• Fast Self-Centering: Three-jaw chuck auto-centers round stock in seconds, boosting throughput.

• Precise Independent Gripping: Four-jaw chuck allows exact centering of irregular shapes and controlled eccentric turning.

• Versatile Mounting: Supports threaded and plain-back configurations for wide lathe compatibility.

• Durable Construction: Hardened steel bodies and jaws resist wear under high clamping forces.

• Complete Kit: Comes with multiple jaw sets and chuck keys to handle inside and outside gripping.

Applications

• Woodturning & Model Making: Securely hold small dowels, spindles, and finials for precision shaping.

• Machining Non-Round Stock: Four-jaw chuck excels at gripping hex bars, square billets, and odd-shaped workpieces.

• Prototype & Repair Work: Quickly adapt between round centering and custom jaw setups for varied tasks.

• Educational & Hobbyist Lathes: Ideal for miniature lathes in workshops, classrooms, and makerspaces.

Usage & Maintenance Tips

1. Initial Setup: Clean spindle and chuck back, then mount with proper torque on mounting screws or spindle threads.

2. Jaw Installation: Ensure inside/outside jaws are correctly oriented before hand-tightening the chuck key.

3. Runout Check: Use a dial indicator to verify runout; adjust four-jaw chuck manually to minimize runout for critical operations.

4. Lubrication: Apply light machine oil to the scroll plate (3-jaw) and dovetail slides (4-jaw) to maintain smooth motion.

5. Jaw Care: Periodically remove and clean jaws to prevent debris buildup that can affect centering accuracy.