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 acceptable runout on a lathe chuck depends on the precision needed for your work and the type of chuck used. For typical 3-jaw chucks:
A very good runout is close to zero, with about 0.001 inch (0.0254 mm) considered good for normal use.
Up to 0.003 inch (0.0762 mm) runout is workable for many applications.
Higher runout levels above 0.005 inch might cause visible wobble and reduced accuracy, making it less desirable especially for precision work.
For more precise requirements, collet chucks or 4-jaw independent chucks are preferred because they can achieve tighter concentricity.
In practice, many users report 3-jaw chuck runout in the neighborhood of 0.002 to 0.004 inches being typical for new or good-quality chucks, with runout around 0.01 mm (about 0.0004 inch) being excellent for a metal lathe chuck. Some inexpensive or low-quality chucks, especially imports, may have runout closer to 0.004 to 0.012 inch or more, which could be problematic for fine work.
Summary guidelines:
Excellent: ~0.001 inch (0.025 mm) or less
Good/normal use: up to 0.003 inch (0.076 mm)
Workable but less ideal: up to 0.005 inch (0.127 mm)
Above 0.005 inch, precision degrades noticeably
If better accuracy is needed, consider using a collet chuck or 4-jaw independent chuck, and always check spindle runout to ensure the baseline machine accuracy is good.
For woodworking lathes, runout under 0.003 inch is typically expected, while for metal lathes, manufacturers often guarantee runout under a few thousandths of an inch.
In summary, acceptable runout is roughly around 0.001 to 0.003 inch for a lathe chuck, depending on your precision requirements and chuck type.
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