Select the correct jaw type for the material being used.
- Rough, unfinished bar stock is held better with hard jaws.
- Clean or turned stock is held better with soft jaws.
Jaw marks can also be reduced or eliminated with soft jaws.
Refer to this video information on how to properly cut soft jaws.
Use a feeler gauge to check for gaps between the chuck jaws and the work piece when clamped. Make sure the jaws grip the part in the middle of the jaw stroke.
Use a spud or boring ring to properly load the chuck before cutting soft jaws.