It’s nice to see a discussion of desktop lathes break out here. I’m a platinum member, I sell both the Sherline and Taig machines, and would be happy to try answering questions about them. While they are certainly capable of making jewelry-scale parts, there’s obviously a size limit to what they can handle, and some tasks, like making rollers for rolling mills, would be beyond what I’d recommend for them. But they would be able to do some operations on the rollers, such as making a groove for a special shape of wire, if that was required. Of course, if the rollers are hardened, it would take carbide or diamond tooling to deal with them.
Andrew Werby