Proper setup of the lathe chuck is important when trying to achieve accuracy in turning materials. The chuck is the component of the lathe that holds the material being worked on the turning spindle. If the run-out on the piece being worked is off, the chuck may need to be adjusted.
Before adjusting the chuck, check for visual signs that it is not installed properly. Any space between the chuck and the back plate may be the cause variances. Also check that all bolts are tightened. If the chuck in not secured to the spindle arm it can cause the piece to shift while being worked. Simple adjustments can be made by tightening the bolts that secure the chuck to the spindle arm. After every adjustment run a test bar to record the measurements and repeat the process until the chuck is installed correctly.
Check with the manufacturer to determine the best way to adjust the lathe chucks. In some cases the chucks may need to be replaced with new ones to improve run-out. Once the chucks have been replace or adjusted the lathe will function better and provide a more accurate finished product.