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 typical chuck size for mini lathes is most commonly 3 inches (about 80mm) in diameter, which is used on many 7x mini lathe models. However, mini lathes can also accommodate 4-inch (100mm) and even 5-inch (125mm) chucks, with the 4-inch size offering more versatility and the 5-inch chuck sometimes considered too large or heavy for smaller mini lathes. The spindle flange size determines the chuck size that will fit; for example, an 80mm spindle flange fits a 3-inch chuck, and a 100mm flange fits a 4-inch chuck.
Key details:
3-inch chucks are most common and come either as 3-jaw self-centering or 4-jaw independent types.
4-inch chucks allow using the full spindle bore size and are often preferred for greater capacity.
5-inch chucks can be used but may be heavy for mini lathes and slow the spindle ramp-up time.
The spindle bore on many mini lathes is typically around 3/4 inch (19mm), limiting the maximum size of stock that can pass through the chuck.
If you want to maximize capacity on a mini lathe, a 4-inch chuck is a good balance between size and usability, especially if the lathe spindle flange is 100mm. For basic hobby use, the 3-inch chuck is standard and sufficient.
| Chuck Size (Diameter) | Typical Spindle Flange Size | Notes |
|---|---|---|
| 3 inches (80 mm) | 80 mm | Most common, standard mini lathes |
| 4 inches (100 mm) | 100 mm | Larger capacity, uses full spindle bore |
| 5 inches (125 mm) | Usually 100 mm | Large for mini lathe, heavier |
Choose the chuck size according to your lathe’s spindle flange and your capacity needs.
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