Mechanical Functions

1. Mechanical Functions

2. Class Starter • Give an example of a technical system and name some of it’s components (different parts that make it up). __________________________________________________________________________________________ • What is a mechanical function? __________________________________________________________________________________________ • What would be the mechanical function of these different components?_________________________________________________________________________________

3. Review - Mouvements • Translation • moves in straight line • Rotation • moves in a circular pattern • Helical • A combination of translation & rotation

4. Review – external Forces • Compression • Force that crushes a material • Tension • Force that stretches a material • Torsion • Force that twists a material • Bending • Force that bends a material • Shearing • Force that cuts or tears a material

5. Mechanical Functions • Technical systems are made up of different components. • Each component in a system plays an important role in the overall functioning of the system. • The role played by a component in a technical system is called a mechanical function.

6. Vocabulary words • Basic Mechanical Function: the role played by a component or a group of components in the function or assembly of a technical object. • Components: the parts or fluids in a technological object that have a mechanical function.

7. Guiding: the basic mechanical function of any component that controls the motion of one or several moving parts. • Guide: a component that has the basic mechanical function of guiding. • Link: connect two or more parts of a technical object. • Linking: the basic mechanical function provided by any component that links an object’s parts. • Linking component: one that has the basic mechanical function of linking.

8. Basic Mechanical Functions • The 2 types of basic mechanical functions we will be looking at are: • Links • Guiding control

9. 1) Links A link connects, fastens, or puts together two or more components of a technical object. Ex: nail, screw, nut, bolt, glue

10. Characteristics of Links • A link always has 4 characteristics. • Direct or indirect • Rigid or flexible • Removable or non-removable • Complete or Partial

11. 1 DIRECT INDIRECT Two parts must hold together WITH a linking component. Two parts can hold together without a linking component.

12. 2 RIGID FLEXIBLE The surfaces of linked parts or linking components can be deformed. The surfaces of linked parts or linking components are rigid.

13. 3 NON- REMOVABLE REMOVABLE Linked parts can be separated with no resulting damage. Separating the linked parts will cause damage.

14. 4 COMPLETE PARTIAL At least one part is capable of motion with respect to the other. No movement between linked parts.

15. Let’s practice… __________________ ____________________ __________________ ____________________ __________________ ____________________ __________________ ____________________

16. directrigid removablecomplete indirectrigid non-removablepartial

17. 2) Guiding Control • Guidance is the function of a part that directs another part along a specific path. • Guidance dictates whether the motion is either rotational or translational. • ROTATIONAL • Ensures the rotational motion of a moving part • Usually a cylindrical part • TRANSLATIONAL • Ensures the straight motion of a moving part • Usually a groove or a slide

18. Rotational or translational guide? ??? ??? ??? ???

19. Translational Rotational Translational Rotational