Page 34 - CITS - Fitter - Trade Theory
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FITTER - CITS



           According to cut
           •  Curved Cut File

           •  Single Cut
           •  Double Cut File
           •  Rasp cut file
           The teeth of all file are formed by cuts made on its face. Files have cuts of different types. Files with different cuts
           have different uses.
           Single cut
           A single cut file has rows of teeth cut in one direction across its face. The teeth are at an angle of 600 to the centre
           line. It can cut chips as wide as the cut of the file. Files with this cut are useful for filing soft metals like brass,
           aluminium, bronze and copper. Single cut files do not remove stock as fast double cut files, but the surface finish
           obtained is much smoother.
           Double cut
           A double cut file has two rows of teeth cut diagonal to each other. The first row of teeth is known as OVERCUT
           and they are cut at an angle of 700 . The other cut, made diagonal to this, is known as UPCUT, and is at an angle
           of 510 . This removes stock faster than the single cut file.

           Rasp cut
           The rasp cut has individual, sharp, pointed teeth in a line, and is useful for filing wood, leather and other soft
           materials. These files are available only in half round shape.

           Curved cut: These files have deeper cutting action and are useful for filing soft materials like - aluminium, tin,
           copper, and plastic
           Care and maintenance during to use of files: File Card It Is a bush the size of a thin star made up of a fine file
           which has a cut for removing trapped metal and particles from leaf teeth.


           Hacksaw frame and its construction


           Definition of hacksaw
           A hacksaw frame is used along with a blade to cut metals of different sections, and is specified by the type and
           maximum length of the blade that can be fixed.

           Example: - Adjustable hacksaw frame - tubular - 250 - 300mm or 8” - 12”.

           Parts of a hacksaw frame
           1  Handle

           2  Frame
           3  Tubular frame with holes for length adjustment
           4  Retaining pins
           5  Fixed blade-holder

           6  Adjustable blade-holder
           7  Wing-nut.
           A hacksaw blade is made of either low alloy steel (LA)
           or high speed steel (HSS), and is available in standard
           lengths of 250 mm and 300mm.







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