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Speed Dating - EFL by emilyfd - Teaching Resources - Tes

Bow drill (strap-drills) are the first machine drills, as they convert a back and forth motion to a rotary motion, and they can be traced back to around 10,000 years ago.

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The attachment is gripped by a chuck at one end of the drill and rotated while pressed against the target material.

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The tip, and sometimes edges, of the cutting tool does the work of cutting into the target material.

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This was used by many ancient civilizations around the world including the Mayans.Kalinago English Speed Dating as Vocabulary Review


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