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004 cutting tools


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004 cutting tools

  2. 2. THE HACKSAW <ul><li>Pistol-grip hand hacksaw </li></ul><ul><li>The blades are made with 14, 18, 24 and 32 teeth per inch. </li></ul><ul><li>Always use a blade suitable for the thickness of the material to be sawed. </li></ul><ul><li>An 18-tooth blade (18 teeth per inch) is recommended for general use. </li></ul>Adjustable Frame Handle Blade
  3. 3. THE HACKSAW <ul><li>The most simple way of selecting a proper blade is to remember that at least two saw teeth should be contacting the material when sawing. </li></ul>Right Blade Wrong Blade
  4. 4. THE HACKSAW <ul><li>Correct use of hacksaw </li></ul><ul><li>Make sure the blade frame is correctly adjusted for length of the blade. </li></ul><ul><li>Place blade in frame so teeth point AWAY from handle. </li></ul>
  5. 5. TO USE THE HAND HACKSAW <ul><li>Check to make sure that the blade is of proper pitch for the job and the teeth point away from the handle. </li></ul><ul><li>Adjust blade tension so that the blade cannot flex or bend. </li></ul><ul><li>Mount the stock in the vice securely. </li></ul><ul><li>Grasp the hacksaw . Assume a comfortable stance. </li></ul><ul><li>Start the saw cut just outside and parallel to a previously scribed line . </li></ul><ul><li>After the cut has started, apply pressure only on the forward stroke. </li></ul><ul><li>When nearing the end of the cut, slow down to control the saw as it breaks through the material. </li></ul>
  6. 6. FILES <ul><li>A file is a hand cutting tool made of high-carbon steel , having a series of teeth cut on its body by parallel chisel cuts. </li></ul>Point Tang Heel Face Edge Length
  7. 7. FOUR TYPES OF FILE TEETH Single Cut Double Cut Rasp Cut Curved Tooth
  8. 8. FOUR TYPES OF FILE TEETH <ul><li>Single cut files are used when smooth finished is desired. </li></ul><ul><li>Double cut files are used for fast removal of metal and easy clearing of chips. </li></ul><ul><li>Rasp cut files are used for cutting wood and very soft metals. </li></ul><ul><li>Curved tooth files are used on aluminum and steel sheets. </li></ul>
  9. 9. CROSS-SECTIONAL VIEWS OF MACHINISTS’ FILES Flat File Round File Half Round File 3 Square File Crossing File Knife Edge File
  10. 10. FILING PRACTICE <ul><li>Never use a file without a handle. </li></ul><ul><li>Fasten the work to be filed, at about elbow height, in a vice. </li></ul><ul><li>Push the file across the work in a straight line and do not rock the file. </li></ul><ul><li>Apply pressure only on the forward stroke. </li></ul><ul><li>Never rub fingers or hand across a surface being filed. </li></ul><ul><li>Keep the file clean by using a file card frequently. </li></ul>
  11. 11. TIGHTENING FILE HANDLE <ul><li>Before attempting to use any file, equip it with a tight-fitting handle similar to the figure shown. </li></ul>
  12. 12. PROPER CARE OF FILES <ul><li>Clean the file with a file card. </li></ul>
  13. 13. CROSS-FILING Correct way to hold a File
  14. 14. DRAW-FILING
  16. 16. Filing
  17. 17. PRECISION FILES <ul><li>Small files having a fine tooth cuts and round integral handles. </li></ul><ul><li>Used in tool and die shop for finishing delicate and intricate pieces . </li></ul>
  18. 18. ROTARY FILES AND BURRS <ul><li>Used for metal pattern making and die sinking. </li></ul>
  19. 19. SCRAPERS <ul><li>Used for removing small amounts of metal from specific areas to produce an accurate bearing surface. </li></ul>