[steveab]

This may be of interest to some:
‘I found two independent researchers, a geologist and a machine tool manufacturer, to see what the stone artifacts could tell us, and what the marks left behind by precision machine tools looked like.’

‘Ivan Watkins is a Professor of Geology, Department of Earth Sciences, at St. Cloud University in St. Cloud, Minnesota. He is investigating the finished surface of Inca stonemasonry. He says the surface of stone, at the microscopic level, indicates how it was, or wasn’t, worked. “And you can rule out the standard issue explanations when it comes to ancient Inca stonemasonry, which is very similar to that of Egypt,” he says.’

‘Now let me introduce you to our guest who reads the signature of precision machine tools, even when he sees them in places that just ‘can’t be,’ according to Egyptologists. And read them he did, from core drills more efficient that our diamond bits today, to “space- age precision” planing, to intersecting lathe marks.’

http://www.lauralee.com/articles/stonecut.htm

Check it out

[bert]

Here is a modern brass drill that uses corundum as a cutting agent. They are used in glass shops everywhere to cut round holes in glass.

[SunkenCiv]

No thanks. I’ve read claims of that kind before, and they are dumb.