Ancient Egyptian granite drill holes and recovered cores can be slightly tapered, wider at the top; one documented 24 cm hole narrowed by 1 cm (4%). The video argues that the taper gave access for chisels, improved stability and prevented flexing at depths above 9 inches, and that multi-tooth bits were used for different depths. Some coring-bit designs had cutting teeth on both inner and outer edges. The video also argues that the striations formed during drilling, not removal.
Ancient Egyptian Granite Cores: The Video’s Taper Theory
Key facts
- Ancient Egyptian drill holes and recovered granite cores can show a slight taper, wider at the top; Penn Museum cites one 24 cm hole narrowing by 1 cm (4%).
- Drill holes were not necessarily straight in cross-section; the holes themselves could be slightly tapered.
- Documented copper coring-drill designs used multiple cutting teeth, including designs with teeth on both inner and outer edges.
- Sources describe chisels being placed in the tapered groove to break the core free.
- The video argues that the taper improved stability and prevented flexing in holes 9+ inches deep, and that different drill-bit designs were used for different depths.
- The video interprets the core striations as drilling marks rather than removal marks; the search evidence does not establish that exclusion.
Sources
Expedition Magazine | Ancient Egyptian Stone-Drilling - Penn Museumpenn.museum
The drilling was done entirely from one end with a relatively slight taper. Over the 24 cm. length of the drill hole there was only 1 cm. or 4% narrowing, ...
Ancient Egyptian Copper Coring Drills - Hall of Maathallofmaat.com
Ancient Egyptian coring barrels would have been made of copper, either cast or cold-worked until the Middle Kingdom, when bronze tools became more readily ...
Egyptian Core Drill Holes In Stone: Evidence Of Machining Before ...hiddenincatours.com
The tube drill used was massive, and cut into the rose granite with ease. But if this is not Dynastic Egyptian, and clearly not Greek, Roman or modern, then ...
Advanced Machining in Ancient Egypt - Spirit & Stonetheglobaleducationproject.org
A symmetrical helical groove following these tapers which showed that the drill advanced into the granite at a feed rate of .100 inch per revolution of the ...
how did the ancient egyptians core drill the hardest of stone?academia.edu
The research reveals that ancient core drill bits featured tapered designs and inward-facing teeth, which minimized friction and created cylindrical cores, ...
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