Most rotary vises can be used like a traditional vise, but setting them up for rotary tying offers numerous advantages. With a true rotary vise, hooks are held with their shanks directly in line with the vise’s axis of rotation. So, procedures like ribbing a fly can be done much more quickly and with far greater accuracy. A beautifully tapered, dubbed body takes no time at all.
A bobbin cradle, although not essential for rotary tying, helps by keeping your thread and bobbin out of the way while the vise is rotated. In most cases, the hook shank and tying thread are kept in rough alignment. With this set-up, you can easily create perfect quill bodies or wrap hackle simply by rotating the vise head.
Even nitpicky herl bodies can be wound on in a jiff. When applying head cement or UV cure resin, being able to rotate the fly prevents sagging and allows you to see all sides of the fly.
You may not always use a vise’s rotary function but it sure is nice to have.