Mechanical Functions Class Starter 1 Give an example

Mechanical Functions

Class Starter 1) Give an example of a technical system and name some of it’s components (different parts that make it up). ________________________________________ 2) What is a mechanical function? ________________________________________ 3) What would be the mechanical function of these different

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

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

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.

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.

�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.

Basic Mechanical Functions �The 2 types of basic mechanical functions we will be looking at are: ØLinks ØGuiding control

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

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

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

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

REMOVABLE NONREMOVABLE Linked parts can be separated with no resulting damage. Separating the linked parts will cause damage.

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

direct rigid removable complete indirect rigid non-removable partial

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

Rotational or translational guide? ? ? ?

Translational Rotational