EE THr
Silver Member
Before the orbital sanders came along, they had sanding disks, which spun around in a circle, and left identifying marks. The marks were in an arc, and parallel.
I don't know when belt sanders were first used, but they would leave straight parallel lines.
Hand sanding usually leaves straight lines, but not necessarily as parallel as a belt sander.
I think stones like these could be made flat simply by rubbing a flat stone on them, or rubbing two stones together. I believe that's how they did it before sandpaper or anything like that was invented.
So it would depend on what the "sanding" marks looked like. But certainly someone made them mostly flat, somehow, so some kind of marks of that type would be expected. But if they are circular and parallel, it would be an indication of power tool usage. But it would need to be more than just two or three arcing scratches which almost matched in curvature, because that could happen even with using a flat rock.
Orbital sanders make identifiable marks, too, but I think it would take a larger area than just the edges, to be able to say that's what it was.
I don't know when belt sanders were first used, but they would leave straight parallel lines.
Hand sanding usually leaves straight lines, but not necessarily as parallel as a belt sander.
I think stones like these could be made flat simply by rubbing a flat stone on them, or rubbing two stones together. I believe that's how they did it before sandpaper or anything like that was invented.
So it would depend on what the "sanding" marks looked like. But certainly someone made them mostly flat, somehow, so some kind of marks of that type would be expected. But if they are circular and parallel, it would be an indication of power tool usage. But it would need to be more than just two or three arcing scratches which almost matched in curvature, because that could happen even with using a flat rock.
Orbital sanders make identifiable marks, too, but I think it would take a larger area than just the edges, to be able to say that's what it was.