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Instructor: James Thornburgh

Unit 2 Threaded Fasteners. Instructor: James Thornburgh. Bring up your Homework & Put on Table. Objectives. Define keywords related to Threaded Fasteners List the three classes of fit Describe the differences between course, fine, and extra fine threads

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Instructor: James Thornburgh

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  1. Unit 2Threaded Fasteners Instructor: James Thornburgh Bring up your Homework & Put on Table

  2. Objectives • Define keywords related to Threaded Fasteners • List the three classes of fit • Describe the differences between course, fine, and extra fine threads • Describe the difference between single and multiple thread fasteners • List the common information contained in a thread note

  3. Objectives • List and identify three different methods to graphically represent threads • Identify and draw different types of screws • Describe the difference between rivets and screws • Draw pipe threads, hex and square bolts and nuts • Use thread tables to specify or draw threaded fasteners

  4. What are Threaded Fasteners • Screws • Terminology

  5. Thread Forms

  6. Class of fit • 1 • Loose fit • For quick assembly • 2 • High Quality • General purpose • 3 • Very High Quality • High Precision, stress, or vibration

  7. Thread Pitch • Determines how far a Fastener goes with each revolution

  8. Thread Notes

  9. Metric Thread Note • Pitch is Distance in mm

  10. Thread Grades

  11. Thread Table • http://www.littlemachineshop.com/Reference/tapdrill.php

  12. Drawing Threads • Detailed • Show detailed thread form • Time Consuming • Rarely used • Schematic • Easier than Detailed • Simplified • Easiest to draw • Used most often

  13. Pipe Threads • Why are they at an angle?

  14. Bolt Hex or Square Head Used with a nut to Squeeze parts Stud Threaded into a Part Attached second part with a nut Cap Screw Longer than a bolt Threaded to the head Threads into part Fastener Types

  15. Cap Screw Can have Socket Head Machine Screw Smaller than Cap Screw Many different head Styles Set Screw With or without a head Used to keep parts still Fastener Types

  16. Square Bolt .5” dia Sq Hd Bolt

  17. Hex Bolt 1” dia Hex Hd Bolt

  18. Making Nuts and Bolts

  19. Machine Screw Heads

  20. Screw Drive Type

  21. Other Screws • Shoulder • Self Tapping • Wood

  22. References • http://www.mcmaster.com • http://www.boltscience.com/ • http://www.Barnhillbolt.com • http://www.fastenal.com

  23. Lab Assignments & Homework • Lab • Handout • Workbook 17.1, 17.2 inst. On Pg 10 • Prob 17.2, 17.8 • Homework • Chapter Questions 1-17 • Online Multiple Choice Quiz

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