Intro to fastener_technology_part3_r2010

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Intro to fastener_technology_part3_r2010

  1. 1. An AerospaceAn Aerospace ManufacturingManufacturing PerspectivePerspective Introduction to Fastener TechnologyIntroduction to Fastener Technology Part 3Part 3 1
  2. 2. Fasteners in AviationFasteners in Aviation  Permanent Fastening Discussed previously  Temporary Fastening Threaded Non-Threaded 2
  3. 3. Temporary Fastening  Threaded – Bolts – Studs – Screws  Non - Threaded 3
  4. 4. Temporary Fastening 4 • some common aircraft fasteners organized by part number
  5. 5. Threaded Fasteners  Use to hold parts together  Unlike any other fasteners, threaded fasteners are able to move part(s) relative to others 5
  6. 6. Threaded Fasteners 6 • Bolts connecting two sections of a PW4098 Turbofan engine
  7. 7. Thread Terminology  External (male) thread: Thread cuts outside of the cylindrical body.  Internal (female) thread: Thread cuts inside of the cylindrical body. Internal thread External thread 7
  8. 8. Thread Terminology  Crest – Peak edge of thread  Root – Bottom of thread cut into a cylindrical body  Thread angle – Angle between threads faces External Thread CrestCrestRootRoot Thread angleThread angle Internal Thread CrestCrestRootRoot 8
  9. 9. Thread Terminology  Major diameter – Largest diameter on an external or internal thread  Minor diameter – Smallest diameter on an external or internal thread Internal ThreadExternal Thread Minordia.Minordia.Minordia. Majordia.Majordia.Majordia. Minordia.Minordia. Majordia.Majordia. 9
  10. 10. Thread Terminology  Pitch – Distance between crests of threads Internal ThreadExternal Thread PitchPitch PitchPitch 10
  11. 11. Types of Thread Form  Profile shape of the thread Example : “knuckle thread form” Example : “knuckle thread form” 11
  12. 12. Thread Standard  A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D and the pitch P, both expressed in millimeters and separated by the multiplication sign “×”.  Example: M8×1.25 10.0010.111.7512.00M12 8.508.381.5010.00M10 6.756.651.258.00M8 5.004.921.006.00M6 Tap drill sizeMinor diameter PitchMajor diameter Nominal size 10.0010.111.7512.00M12 8.508.381.5010.00M10 6.756.651.258.00M8 5.004.921.006.00M6 Tap drill sizeMinor diameter PitchMajor diameter Nominal size Minor diameter ≈ Tap drill size Metric thread 12
  13. 13. Thread Drawings For simplified representation, use thick and thin continuous lines for representing crests and roots respectively: External thread Internal thread Pitch/2Pitch/2 RootRoot CrestCrest Thread runout 13
  14. 14. Bolt Terminology  Bolt is a threaded cylinder with a head Hexagonal head bolt and nut Head thickness Head thickness Thread lengthThread length LengthLength Width across flat Width across flat 14
  15. 15. Bolt Application 1. Insert a bolt into a clearance hole 2. Insert a washer. 3. Screw a nut. 15
  16. 16. Bolt Application - Engine 16 • Engine case bolt and nut on a Lycoming IO-320 engine • Nut is on the left hand side, bolt head is on the right
  17. 17. Screw Terminology  Screw is similar to bolt, but has a longer thread than a bolt  Bolted joint is usually created by turning a nut; screw is installed by turning it. 17
  18. 18. Screws Application x drill, CSK to φy x drill, w deep, CSK to φy yy Draw 90oDraw 90o 1. Drill a hole. 2. Place the screw. 18
  19. 19. Screws Application - Fuselage 19 • Countersunk screws are flush with the skin on this Cessna 310R
  20. 20. Screws Application - Engine 20 • Exhaust shroud screws on an IO-320 engine
  21. 21. Stud Terminology Thread length Length Thread length Drawing representation 21
  22. 22. Stud Application 1. Drill a hole. 3. Screw a stud. 4. Place the part to be fastened. 5. Insert washer and fastened a nut. 2. Tap a hole. 22

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