Mechanical Functions

Mechanical FunctionsClass StarterGive an example of a technical system and name some of its components (different parts that make it up). __________________________________________________________________________________________What is a mechanical function? __________________________________________________________________________________________ What would be the mechanical function of these different components?_________________________________________________________________________________

Review - MouvementsTranslationmoves in straight line

Rotationmoves in a circular pattern

HelicalA combination of translation & rotation

Review external ForcesCompressionForce that crushes a material

TensionForce that stretches a material

TorsionForce that twists a material

BendingForce that bends a material

ShearingForce that cuts or tears a material

Mechanical FunctionsTechnical 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 wordsBasic 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 objects parts.Linking component: one that has the basic mechanical function of linking.Basic Mechanical FunctionsThe 2 types of basic mechanical functions we will be looking at are:LinksGuiding controlA link connects, fastens, or puts together two or more components of a technical object.

Ex: nail, screw, nut, bolt, glue

1) LinksCharacteristics of LinksA link always has 4 characteristics.

Direct or indirect

Rigid or flexible

Removable or non-removable

Complete or Partial1DIRECTINDIRECTTwo parts can hold together without a linking component.Two parts must hold together WITH a linking component.

112RIGIDFLEXIBLEThe surfaces of linked parts or linking components are rigid.

The surfaces of linked parts or linking components can be deformed.

123REMOVABLENON-REMOVABLELinked parts can be separated with no resulting damage.Separating the linked parts will cause damage.

134COMPLETEPARTIALNo movement between linked parts.At least one part is capable of motion with respect to the other.

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directrigid

removablecomplete

indirectrigid

non-removablepartial

2) Guiding ControlGuidance is the function of a part that directs another part along a specific path.

Guidance dictates whether the motion is either rotational or translational.

ROTATIONALEnsures the rotational motion of a moving partUsually a cylindrical partTRANSLATIONALEnsures the straight motion of a moving part Usually a groove or a slideRotational or translational guide?

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???TranslationalRotational

Translational

Rotational