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CARPENTRY: DRILLING TOOLS
Gear-driven hand tool, used mainly to drill holes in wood, soft metal and plastic.
Handle whose rotation turns the drive wheel, which in turn transmits the motion to the pinion and the chuck.
In horizontal drilling, it stabilizes the tool while the other hand rotates the turning handle.
Detachable shank that is inserted into the chuck, whose rotating motion drills holes in various materials.
examples of bits and drills 
Device with jaws for attaching the bit or drill to the tool.
Small toothed wheel downshifting the turning handle’s motion: each turn of the handle translates into at least three rotations of the chuck.
Toothed wheel that meshes with the pinion, thereby transmitting its rotational motion.
In vertical drilling, it stabilizes the tool while the other hand rotates the turning handle.
The parts of the chuck that grip the tool to keep it firmly in place.
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