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Sophie 🙂 asked Can someone tell me all about drills?
As in the ones you use for drilling holes and screws in place. My gcse resistant materials exam is tomorrow and the theme is drills. Handheld or machine operated. What are the essentials I should know about? Anything about the gears inside? Thanks!
And got the following answer:
*A drill (from Dutch Drillen) is a tool with a rotating drill bit used for drilling holes in various materials. Drills are commonly used in woodworking, metalworking, construction and DIY. The drill bit is gripped by a chuck at one end of the drill, and is pressed against the target material and rotated. The tip of the drill bit does the work of cutting into the target material, either slicing off thin shavings (twist drills or auger bits), grinding off small particles (oil drilling), or crushing and removing pieces of the workpiece (SDS masonry drill). *Types of drills: Hand tools Pistol-grip (corded) drill Hammer drill Rotary hammer drill Cordless drills Drill press Geared head drill Radial arm drill Mill drill *A variety of hand-powered drills have been employed over the centuries. Here are a few, starting with approximately the oldest: Bow drill Brace and bit Gimlet Breast drill, also known as "eggbeater" drill Push drill, a tool using a spiral ratchet mechanism Pin chuck, a small hand-held jewellers drill . *Geared head drill: The geared head drill is identical to the drill press in most respects, however they are generally of sturdier construction and often have power feed installed on the quill mechanism, and safety interlocks to disengage the feed on overtravel. The most important difference is the drive mechanism between motor and quill is through a gear train (there are no vee belts to tension). This makes these drills suitable for use with larger drill bits. *Radial arm drill: A radial arm drill is a geared head drill that can be moved away from its column along an arm that is radiates from the column. These drills are used for larger work where a geared head drill would be limited by its reach, the arm can swivel around the column so that any point on the surface of the table can be reached without moving the work piece. The size of work that these drills can handle is considerable as the arm can swivel out of the tables area allowing an overhead crane to place the workpiece on the fixed table. *Eggbeater drills are hand-drills having a bevel-gear mechanism. http://www.wkfinetools.com/tRestore/miscTools/tuningEggbeater/index.asp *click on: http://en.wikipedia.org/wiki/Drill