76winger
Member
Just looking for others observations: I see this show up in peoples postings repeatedly and just wonder how many people to and don't have problems with it?
It seems mostly it's related to using mandrels but I'm pretty sure I've seen some turning between centers having it as well. I would think TBC would minimize or elimiate it on a good solid lathe that doesn't have any bearings out of round or loose or whatever.
From my own experience, even with a Shopsmith for my lathe (which is not nearly as tight as a dedicated lathe) and mandrel, I have very little problems with it. The way I typically turn is with a skew and when I'm making those final fine slices as the body is getting down to size, my technique is lay the flat face of the skew directly on the bushing where it's just "riding" on it, then very lightly take those last few fractions of a millimeter off before sanding and finishing. So unless my bushings happen to be out of round (and maybe I've been lucky here), there's no visibly discernible runnout in the final turned body.
As I've thought about it, I'm wondering if it's because many that have the problem might be holding carbide scraper-type cutters, very tightly to the tool rest and any runnout from the mandrel is then translated into one side of the turned body being slightly thicker than the other side.
Maybe this has been discussed before, but my searching abilities usually don't find me what I'm looking for in forum searches, either finding too much to sift through or nothing.
Anyway, what's everyone's thoughts and observations on this?
It seems mostly it's related to using mandrels but I'm pretty sure I've seen some turning between centers having it as well. I would think TBC would minimize or elimiate it on a good solid lathe that doesn't have any bearings out of round or loose or whatever.
From my own experience, even with a Shopsmith for my lathe (which is not nearly as tight as a dedicated lathe) and mandrel, I have very little problems with it. The way I typically turn is with a skew and when I'm making those final fine slices as the body is getting down to size, my technique is lay the flat face of the skew directly on the bushing where it's just "riding" on it, then very lightly take those last few fractions of a millimeter off before sanding and finishing. So unless my bushings happen to be out of round (and maybe I've been lucky here), there's no visibly discernible runnout in the final turned body.
As I've thought about it, I'm wondering if it's because many that have the problem might be holding carbide scraper-type cutters, very tightly to the tool rest and any runnout from the mandrel is then translated into one side of the turned body being slightly thicker than the other side.
Maybe this has been discussed before, but my searching abilities usually don't find me what I'm looking for in forum searches, either finding too much to sift through or nothing.
Anyway, what's everyone's thoughts and observations on this?