John,
You bring up a topic in a previous post that I have been pondering. I have paid attention any time I see them and all I see is volume in cubic inches. That does not compute. Call me math challenged but my right brain doesn't think like that. What I need is height, width, wall thickness to turn any hollow form. How big should the opening in the top be? The other thing is the cap. It is my understanding that the cap must be a screw on top. I have never chased threads and besides that my lathe will not go slow enough to do that. 450RPM is a tad fast I think. People have used PVC threads.
If you and others who have turned urns for individuals or funeral homes I would appreciate input on dimensions etc. Thanks