งานสอน ดอกเจาะผายปาก

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งานสอน ดอกเจาะผายปาก

  1. 1. Center Punch Center DrillDrillCounter Sink Counter Bore Reamer
  2. 2. (CENTER PUNCH)
  3. 3. Center Drill)
  4. 4. 
  5. 5. 
  6. 6. (DRILLS)
  7. 7. Screws)
  8. 8. (COUNTERSINKING)When a screw is driven into a piece of wood, it sometimesdoesn’t matter that the head of the screw is sticking up out ofthe wood. Sometimes it matters a lot and it has to be avoided.When this is the case, a countersunk screw is used. Thespecial shape of the head allows it to go ‘flush’ with thesurface of the wood. To work best of all, the hole should beprepared for the screwhead to fit into it. It is prepared using acountersink drill bit in the manner shown below. The head ofthe countersunk screw will now fit snugly into the preparedholea countersunk holeThis is the countersink drill bit which is placedin the chuck of the drilling machine andproduces the angled hole which makes thecountersink.Notice how thehead of thecountersunkscrew is ‘flush’with the surfaceof the wood.
  9. 9. (Drill)
  10. 10. (Rivet)
  11. 11. (Counter Bore)
  12. 12.  1/3
  13. 13. COUNTER BORE
  14. 14. (Reamer)
  15. 15. (REAMER)(Fit and Tolerance)• (Straight Flutes)• (Spiral Flutes)208281 Workshop Practice Created by Prateep Chaisermtawan
  16. 16. REAMER(Hand Reamer)-(taper sleeve)208281 Workshop Practice Created by Prateep Chaisermtawan
  17. 17. (MachineReamer)2.1(Jobber’s Reamer)2.2(Chucking Reamer)2.4(Expansion Chucking Reamer)2.3(Rose Reamer)2.5(Shell Reamer)208281 Workshop Practice Created by Prateep Chaisermtawan
  18. 18. 
  19. 19. 
  20. 20. 0.05

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