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Chapter 11: Threads and Fasteners

Chapter 11: Threads and Fasteners. Agenda . Why they are important Creating Threads and blocks to re-use them Creating Hexagonal Bolt and Nut shapes. But First…TEST 2 !!!. Next Saturday 1-2PM Will Cover: Chapters 6 -10 Sectional Views Auxiliary Views Dimensioning Tolerancing

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Chapter 11: Threads and Fasteners

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  1. Chapter 11: Threads and Fasteners

  2. Agenda Why they are important Creating Threads and blocks to re-use them Creating Hexagonal Bolt and Nut shapes

  3. But First…TEST 2 !!! • Next Saturday 1-2PM • Will Cover: Chapters 6 -10 • Sectional Views • Auxiliary Views • Dimensioning • Tolerancing • Geometric Tolerancing • Open Book and Notes • You may be asked to do a hand sketch • Practice Visualizing aux views…see examples

  4. Sample Auxiliary View Problems

  5. Threads and Fasteners • Most mechanical objects need to be held together • DesignCenter choices are somewhat limited • More flexibility and better clarity by making our own and saving for later use • We’ll use them next week: • working drawings

  6. Design Center Demo • Pre-constructed blocks • Choose Fasteners, US or • Metric • Place, resize, etc

  7. 3 ways to represent threads

  8. Threads—terms and specs Preferred Metric Threads Pitch in threads/mm or threads/inch

  9. Thread specs for English Units (Inches)

  10. Detail Thread (Inches)

  11. Creating wblocks • After drawing the object you want to re-use • Select the object • Type “wblock” • Choose a filename reflecting it’s content: • DETLIN-1in • And a place to store it (myDocs, Desktop, USB) • Then you can choose Insert>Block, find the file, and insert (rotating or scaling first as needed)

  12. MM thread Or try scaling the inch thread by 20 and saving as a new wblock DETLMM

  13. Internal Thread explode then erase, Hatch ANSI 31

  14. Schematic Thread

  15. Metric Thread, scale inch by 20 Save as SCHMMM

  16. InternalSchematicThread Scale by 36/20=1.8 Section using Hash ANSI31

  17. Simplified thread Draw hatch before hidden lines

  18. Ortho & SecViews • Internal Threads

  19. Bolts, Nuts, Screws, Studs

  20. Nuts and Bolts • Hex Head Bolts HEXHEAD-10mm.dwg • Distance across flats should be 1.5D • D=major diameter of the thread • Head thickness should be 0.67D • Finishing Nuts FNUTHEX-10mm.dwg • Thickness = .88D • Locking Nuts LNUTHEX-10mm.dwg • Thickness = 0.5D • Insert and scale to Major Diameter of thread

  21. Sample Problem 11-1: Threaded hole depth Pilot hole depth

  22. SP11-2: Length of bolt

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