Egyptian drill cores were tapered—wider at top. The taper provided stability during deep drilling, allowed room to insert a chisel to snap off the core, and prevented flexing. Multiple cutting tips, not single. Sophisticated mechanical understanding.
Granite Drill Core Taper Analysis and Function
Key facts
- Drill cores found in ancient Egyptian sites are tapered (wider at top)
- The holes drilled into stone are straight, but the cores removed are tapered
- Taper allows room to insert chisel or lever to snap off the core
- Tapered interior of tool provides stability during drilling process
- Multiple cutting tips on inside and outside of tool rather than single tip
- Tapered design necessary for deep cores (9+ inches) to prevent flexing
- Theory explains why striations cannot be from removal - taper means no contact when pulling up
- Different tools were designed for specific depths
- This represents sophisticated mechanical understanding
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 ...
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