Have you seen this vise model before?

[Saltfever]

There is elegance in simplicity! The modular nature of your design has given me some great ideas. Replaceable jaws can be easily changed. A feature can be machined on one side of the jaw and then turned around as needed. I would certainly have a vertical “V” grove in the middle of a jaw for round stock as wells as a horizontal V grove in one of the gripping jaws. Additional jaws with special features can be machined and added as needed. My only concern is the one feature that makes the vise so adaptable. A dovetail concentrates stress and a failure will occur over time. I will try to create a radius at the bottom of my dovetails.

Thank you for sharing your idea. All the best.

PS: One set of vise jaws could have dovetails. You machine a matching dovetail on your stock and have tremendous gripping strength with as little as 0.060" (1.5mm) stock. When you have finish machined the top it is turned over and the small amount of stock is removed.