Although not nearly as common as 3- or 4- Jaw chucks, a 2-Jaw Chuck can be quite handy for certain 4th Axis jobs. The jaws on a 2-Jaw chuck are opposite each other (obviously!) and they are driven by a scroll plate, just like the jaws on a 3-Jaw chuck. They are typically used in 2 scenarios:
Here's a quick video with Mike C. demonstrating some setup basics when using a 2-Jaw Chuck:
We have 2 Jaw Chuck kits available for both 6" and 8" Tormach 4th Axis models:
More Tormach Fab Lab Videos: