Anyone got any experience with honing of ID profiles? What I'm specifically looking for is a way to hone a mostly cylindrical profile that gradually tapers (about 1.5 degree taper) about 2/3 the way into the bore. It'd have about 10" depth of bore with a cylindrical profile, about 1.250 diameter, before tapering in to about 1.200 (dims are just for example - exact dimensions aren't actually determined yet). The larger cylindrical bore is where the tolerance and surface finish needs to be held tight for a sliding surface, the tapered part is for structural reasons so both tolerance and surface finish requirement are looser on that, but it does need to be reasonably smooth to eliminate stress risers.
Is there such a thing as a form hone that would be able to do that? I've only ever seen them as cylindrical but it's not something I have much experience with. I imagine I'd need a form tool (like a partially tapered reamer or similar) to rough out the initial geometry and make sure that only a small amount of material is left for honing? I think even with a damped boring bar the total length of the part (about 20") is much too great of a L/D ratio to be able to bore that geometry.
Is there such a thing as a form hone that would be able to do that? I've only ever seen them as cylindrical but it's not something I have much experience with. I imagine I'd need a form tool (like a partially tapered reamer or similar) to rough out the initial geometry and make sure that only a small amount of material is left for honing? I think even with a damped boring bar the total length of the part (about 20") is much too great of a L/D ratio to be able to bore that geometry.