carpentry 1- explosive actuated tools

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carpentry 1- explosive actuated tools
2014-03-23 16:41:53
carpentry 1- explosive actuated tools
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  1. how does a low velocity tool drive a fastener?
    it uses the force of the explosion to drive a piston which drives the fastener
  2. how does a high velocity tool drive a fastener?
    uses high level power load which drives the fastener directly
  3. for which types of structural loads are explosive actuated tool fasteners suited?
    static loads (dead loads)
  4. what type of power load must be used in the low velocity tool? why?
    crimped because the wad would interfere with the piston
  5. state the 6 load colours used ranging from the lowest strength to the highest
    • grey
    • brown
    • green
    • yellow
    • red 
    • purple
  6. what 2 methods do power load containers use to show the load strength?
    number colour
  7. do power loads have to be approved by the manufacturer of the tool before it can be used in that tool?
  8. how are fasteners aligned and retained in the tool?
    plastic washer, eyelet, or fluted plastic
  9. fasteners used in explosive actuated tools are manufactured out of what materials?
    special steel that is tempered so it wont break
  10. describe 2 applications for drive pins
    • 1. anchoring wood plates
    • 2. wire hangers
  11. a threaded knurled pin is best used with what base material?
    mild steel
  12. list 3 finishes available for fasteners
    • 1. stainless steel
    • 2. zinc
    • 3. black laquer
  13. what is meant by base material?
    the material into which the fastener shank is driven and from which holding power is attained
  14. list 2 base materials that are too hard to safely to using an explosive actuated tool.
    • tempered steel
    • spring steel
  15. list 2 material that are to brittle to safely fasten to using an explosive actuated tool
    • glazed tile 
    • brick
  16. list 2 base materials that are too soft to safely fasten to using an explosive actuated tool.
    • drywall
    • wood
  17. new concrete should be cured for how many days before fastening is attempted?
    seven days
  18. describe how a fastener in concrete obtains its holding power.
    the fastener displaces the base material during penetration, compressing the area surrounding it. the base material attempts to return to its original form and exerts compressive forces on the fastener. the action of driving the fastener produces extreme heat, fusing concrete particles to the shank and dramatically increases loading strength.
  19. does spalling reduce the holding power of a fastener? explain.
    it can if the spall area extends into the compressive bond zone
  20. what is the recommended shank penetration for good holding power when fastening into concrete?
    6-8 times the diameter of the shank
  21. what minimum thickness of concrete can you safely fasten to?
    3 times the penetration of the fastener
  22. when fastening into thin steel the fastener point should protrude 6 mm 1/4" to prevent what from occurring?
    elastic action of the steel can force the fastener back
  23. pin fasteners should not be driven into steel thinner than what?
    the shank diameter
  24. why is fastening through an existing hole in steel not recommended?
    the fastener could strike the edge of the hole and deflect
  25. what must you have in order to be qualified to operate an explosive actuated tool?
    training in the use of each tool to be used and familiarity with local safety regulations
  26. what ppe must always be worn when using explosive actuated tools?
    eye protection
  27. what procedure should you follow in case of a misfire?
    in case of a misfire, keep the tool compressed against the work surface for 30 sec. without removing the tool from the work surface, recompress the tool and try and fire . if the power load still fails to ignite, wait another 30 sec. after this time remove the defective power load from the tool and soak it (or the strip)in water.
  28. what does the occupation health and safety say must be worn in confined spaces?
    earplugs and eye protection
  29. who is responsible if an accident occurs as a result of an unattended explosive actuated tool?
    the operator
  30. should an explosive actuated tool be used in an explosive or flammable area?
  31. under normal working conditions, how often should an explosive actuated tool be cleaned?
    when it becomes sluggish from carbon deposits after each days use or after extended operations
  32. how much oil should be added to the tool parts after cleaning?
  33. which part requires replacement often in a low velocity tool?
    the buffer
  34. power loads should not be carried loosely in pockets or aprons with drive pins or other metal objects. why?
    they may be set off causing injury
  35. what are the primary callibres of power loads?
    .22 .25 .27
  36. are nickel cased cartridges available for low velocity tools?
  37. whats a knurled shank for?
    to increase holding capacity
  38. how do you classify heavy duty fasteners?
    heavy duty has a shank diameter 4.83mm 3/16 and bigger where as light duty fasteners are less than 4.83mm  3/16
  39. what can be used to prevent spalling?
    finishing disk or spall reducing adaptor
  40. where should you always fasten on concrete blocks?
    solid section or horizontal mortar joints
  41. how do you properly set a fastener with a low velocity explosive actuated tool in concrete?
    2 " from the edge of the concrete with minimum 3"  spaces in between fasteners
  42. how do you properly set a fastener with a low velocity explosive actuated tool in steel
    12mm 1/2" from the edge and 1" 25mm spacing between fasteners