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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The capacity of a 4-jaw chuck varies depending on its diameter and specific design. There isn't a single universal value, as these chucks come in several sizes, each with its own capacity range. Below are details and examples to illustrate typical holding capacities for commonly used 4-jaw chucks.
Small Chucks (e.g., 3-4 inches/80-100 mm):
Can hold parts from approximately 3/32″ (2 mm) up to 1-1/2″ (38 mm) in diameter with jaws in the normal position, and up to 2-3/4″ (70 mm) with jaws reversed.
For example, a 4" (100 mm) independent 4-jaw chuck usually has:
Inside jaws: 0.24" - 1.77" (6-45 mm)
Outside jaws: 1.57" - 3.94" (40-100 mm)
Practical max capacity (outside jaws): 5.00" (127 mm).
Medium Chucks (e.g., 8 inches/200 mm):
May have a holding capacity up to 8" (200 mm) in diameter.
Minimum jaw capacity depends on jaw configuration; some sources list minimum gripping at about 0.15" (4 mm).
Large Chucks (e.g., 12" and above):
Suitable for holding larger objects, sometimes up to 32" (812 mm) for heavy-duty machining operations.
Self-centering models will have slightly different ranges but typically are similar in capacity to independent models for a given size.
Some heavy-duty or combination chucks (independent and self-centering) specify both minimum and maximum capacity, e.g., holding capacity from 160 mm to 750 mm for larger industrial use.
Reversibility : Many 4-jaw chucks have reversible jaws, increasing their capacity range.
Through Bore Size : The hole through the chuck (for long stock) is also an important consideration, e.g. a 4" chuck might have a through bore of 20 mm (0.79").
Mounting : Chucks come with various mounting options (plain back, direct mounting, camlock).
| Chuck Diameter | Typical Clamping Capacity (Normal Jaws) | Typical Clamping Capacity (Reversed Jaws) |
|---|---|---|
| 3" (80 mm) | 3/32" to 1-1/2" (2 to 38 mm) | Up to 2-3/4" (70 mm) |
| 4" (100 mm) | 0.24"–1.77" (6–45 mm) inside, 1.57"–3.94" (40–100 mm) outside | Up to 5.00" (127 mm) outside jaws |
| 8" (200 mm) | Up to 8" (200 mm) | Varies |
| Larger sizes | Up to 32" (812 mm) | Varies |
Actual capacity always depends on the chuck's size, jaw configuration, and whether the jaws are set for internal or external gripping.
Checking manufacturer specifications is crucial for an exact figure for a specific 4-jaw chuck model and size.
In summary
:
A 4-jaw chuck can hold parts ranging from a few millimeters up to several hundred millimeters, depending on chuck diameter, jaw configuration, and model. Always consult your specific chuck’s documentation for precise capacity details.
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