Sub Module 7.3: Twist Drill (MCQ)
EASA MODULE 7A Sub Module 7.3 TOOLS TWIST DRILL ( MCQs): Loading…
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Sub Module 7.3 Files (ESSAY)
EASA MODULE 7A Sub Module 7.3 TOOLS Files Files are cutting tools for removing metal from a surface and are made of high-carbon steel. The blade is hardened, whilst the tang (to which, a handle must always be attached, for safety reasons, before the file is used), is left in a softer, tougher condition and is, therefore, less brittle. Hand files are classified by their: Length Shape Cross-Section Cut Grade The length of a file is measured from the shoulder to the tip of the blade. Files are available, for special work, in lengths from 75 mm (3 in) to 350 mm (14 in). The most common sizes are 150 mm (6 in), 200 mm (8 in) and 250 mm (10 in). Files are available in a variety of shapes (refer to Fig. 3.9), and the most common shapes are those which are: Tapered Parallel Bellied Shapes of Files The various shapes and the cross-sections of files allow them to be used on a wide range of tasks. The standard file ...
Sub Module 7.3: Filing Techniques (ESSAY)
EASA MODULE 7A Sub Module 7.3 TOOLS Filing Techniques: Good filing is not just a matter of removing surplus metal. The correct amount of material, at each point on the surface of the work piece, needs to be removed, so that the dimensions and tolerances, set by the drawing, will be met. Proficiency comes with practice. New files should, if possible, be first used on soft metal. This achieves ‘tempering’ of the cutting teeth and will contribute to a longer life for the file. Before starting work, it must be ensured that the work piece is secure and correctly placed, as both hands are required for filing tasks. A file must never be used without a handle. The file will not be under full control and the risk of puncturing the wrist or palm is very great. Files must be handled carefully. File blades, being hard, are also brittle and will break if dropped. After use, all files should be returned to their respective racks or bandolier-type holdalls, to prevent them knocking toget...