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Joints

Joints . What are they. What we use to fasten structures together Structures are often weakest where they are joined together 2 Main types: Mobile and Rigid . Mobile joints.  Hold parts together while still allowing movement  Must have some form of lubricant so that they move smoothly

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Joints

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  1. Joints

  2. What are they • What we use to fasten structures together • Structures are often weakest where they are joined together • 2 Main types: • Mobile and Rigid

  3. Mobile joints • Hold parts together while still allowing movement •  Must have some form of lubricant so that they move smoothly • Examples: • Door hinges • Elbows • Pins in a bicycle chain • Other examples

  4. Rigid Joints • Fix and object into place; joint that allows no movement • Most rigid joints fit into 5 categories • Fasteners • Interlocking Shapes • Ties • Adhesives • Melting

  5. Fasteners • Nails • Screws • Rivets • The holes these fasteners make weaken the materials they fasten. • More fasteners, make a more rigid joint… more holes • Kind and number must be carefully planned • Other examples?

  6. Interlocking shapes • Using carefully shaped parts to hold themselves together • Examples: • Wooden Drawers • Folded seams in clothing • Other examples?

  7. Ties • Threads • String • Ropes • Used to fasten things together (usually flexible materials) • Ideas where we use/see ties as joints?

  8. Adhesives • - Sticky substances that when they harden it locks the pieces together • Creates a bridge between two surfaces and locks them together • Thermosetting glues harden as they cool (ex. Hot glue gun) others are solvent based meaning they dry out to harden. • Super glue goes through a chemical reaction to bond pieces together • Problems: • May fail if they get wet or are in a hot climate • Health hazard: sticking fingers together, powerful chemicals into the air

  9. Melting • Pieces of metal or pieces of plastic can me melted together • Welding: melts pieces to themselves • Soldering: surrounds piece with a different melted material • Pieces must be carefully cleaned before joining, and it must be cooled slowly • Other ways to melt materials? Examples of Melted joints

  10. Acronyms Can you think of any good ones? Ties Fasteners Melting Adhesives Interlocking shapes

  11. Review Game Stand up if… 1. you can identify the type of joint It is… Rigid or mobile If rigid what type OR 2. Can correctly answer the question posted

  12. Structures are often weakest where they are _______________ together.

  13. Screw

  14. What type of melting… • Surrounds a piece of metal with a different melted material?

  15. Brick wall

  16. What type of rigid joint • Is usually used to fasten together flexible materials?

  17. Window hinge

  18. What is the type of rigid joint… • Sticky substances that when they harden it locks the pieces together.

  19. When might a rigid adhesive joint fail?

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