Drilling granite with copper and sand
From 27th of March 2020
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For some unknown reason experienced stone masons and building industry experts say it's impossible, and aren't content with simply testing it for themselves with some sand and a power drill fitted with a copper tube. So here's the footage of a hand powered flywheel drill just as depicted in Ancient Egypt and Mesopotamia.

Raw footage of drilling granite with copper and sand (quartz). During the event of early 2020 I sat down and drilled various types of granite with a copper tube and different abrasives/abrasive mixes.

The abrasive I use in this example is just crushed local Sydney sandstone- the yellow variety which unlike the darker types has very very little iron in it. Either way Iron is less abrasive than the quartz in the sandstone and that is what does the cutting.

Sandstone and granite have the same Mohs Hardness of 6-7 because they both contain quartz.

Just like diamond cuts diamond so does quartz cut quartz. You don’t need a harder material to cut or drill or polish. Like cuts like. Just rub two pieces of granite together.

Copper is soft but so is paper, sand paper cuts metals or stone. Since it is the abrasive sand not the paper that does the cutting. The sand cuts and the copper is nothing more than the paper. I used a modern copper tube of 99.9% + pure copper. Ancient Egyptian copper was an alloy of arsenic effectively making it bronze. At least what is known as arsenical bronze or arsenical copper. Some samples of Ancient Egyptian copper have up to 3.1% arsenic.

Arsenical bronze is comparable to mild steel/wrought iron.

By using a tube of modern 99.9% + copper I am at a disadvantage.

Drilling speeds:

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Reports 8 to 12 mm per hour at 150 RPM

Here’s a video by the same team of their drilling. [ Ссылка ]
They use a heavier weight on their flywheel drill than I do. I have a higher RPM of 300. I get the same drill speed of approx 1cm an hour.

Further experimentation in the perfect balance between RPM and the weight of the drill.

Related videos:

Tapering of the cores- inevitable. A signature of primitive techniques.
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Using a PVC pipe and sand to drill granite

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Hand powered drill RPM is optimal for granite [ Ссылка ] Copper and wood to break cores out of granite- steel is not necessary
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Striations on granite for hand powered fly wheel drill preliminary [ Ссылка ] #coredrilling #lostancienthightechnology

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