The 4H type
four-jaw hollow power chuck is a specialized lathe chuck designed for gripping workpieces with high precision and versatility. Here are its key features and specifications based:
Description and Features
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The 4H type chuck has four jaws that move independently, allowing for precise centering and gripping of irregularly shaped workpieces such as square or octagonal blocks.
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It is a hollow power chuck, meaning it has a through-hole design that allows long workpieces or bar stock to pass through the chuck, which is advantageous for certain machining operations.
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The chuck is typically hydraulic or pneumatic powered, providing strong and consistent clamping force with minimal operator effort.
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It is suitable for CNC lathes and other machine tools requiring high-speed and high-precision workholding.
Technical Specifications (Example from 4H/4H-A Series)
|
Model
|
Max Chucking Diameter (mm)
|
Max Clamping Force (kN)
|
Max Speed (rpm)
|
Weight (kg)
|
Max Pressure (MPa)
|
|
4H-12
|
304
|
143.6
|
2700
|
~63
|
2.5
|
|
4H-15
|
381
|
179.8
|
2000
|
~125
|
2.3
|
|
4H-18
|
450
|
179.8
|
1700
|
~165
|
2.3
|
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Jaw stroke is typically around 10.6 mm.
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The chuck uses wedge-hook mechanisms for secure gripping.
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The design supports high accuracy with runout between 0 and 0.001 mm.
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The chuck body and jaws are made for durability and high-speed operation.
Applications
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Ideal for holding square, octagonal, or irregularly shaped workpieces.
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Commonly used in CNC lathe machining, hydraulic power lathe chuck setups, and other precision turning operations.
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The hollow design facilitates machining of long shafts or bars without removing the chuck.
Summary
The 4H type four-jaw hollow power chuck is a versatile, high-precision hydraulic or pneumatic chuck with independently adjustable jaws and a through-hole design. It offers strong clamping force, high accuracy, and is suitable for CNC lathes handling various workpiece shapes and sizes, especially where a hollow chuck is beneficia.
