SECTIONINGSECTIONING

SECTIONINGSECTIONINGIt is the process of It is the process of representing the representing the interior feature or interior feature or

structure of an structure of an object.object.

Used to clarify interior or hidden details on a multi-view drawing of an object.

TERMINOLOGYTERMINOLOGYusedusedin in

SECTIONINGSECTIONING

Cutting PlaneCutting Plane It is used to It is used to

indicate the indicate the location of an location of an imaginary cut imaginary cut through the through the

object.object.

CUTTING PLANE LINECUTTING PLANE LINEIt is a line defining the exact It is a line defining the exact

location where the component will location where the component will cut into a face.cut into a face.

Cutting Plane LineCutting Plane Line

SECTION VIEWSECTION VIEW It is an It is an

orthographic orthographic view that view that shows the shows the interior interior features of an features of an object as object as visible lines.visible lines.

SECTION VIEWSECTION VIEW

SECTIONAL VIEW

SECTION LINESSECTION LINES Used to show Used to show

surfaces that surfaces that have been cut in have been cut in the section viewthe section view

Section lining is the Section lining is the symbolic representation symbolic representation of surfaces used to of surfaces used to indicate the material indicate the material used in producing the used in producing the object or the finish object or the finish given to the surface of given to the surface of the objectthe object..

Rules in Drawing Rules in Drawing Section LinesSection Lines

1.) Section lines should 1.) Section lines should be thinner than visible be thinner than visible lines (.2).lines (.2).

2.) Section lines within a 2.) Section lines within a sectioned area must sectioned area must be parallel. be parallel.

3.) Always draw section 3.) Always draw section lines at 45 degrees to lines at 45 degrees to the horizontal.the horizontal.

55.) Space section .) Space section lines between 2 to 5 lines between 2 to 5 mm apart mm apart depending on the depending on the size of the drawing.size of the drawing.

6.) When two or more 6.) When two or more parts in a section are parts in a section are adjacent, use section adjacent, use section linings in opposing linings in opposing directions.directions.

TYPES OF SECTIONINGTYPES OF SECTIONING

HALFSECTION

BROKEN-OUT

SECTIONFULL

SECTION

REVOLVED SECTION

REMOVEDSECTION

OFFSET SECTION

ALIGNEDSECTION

FULL SECTIONFULL SECTION Is a section view Is a section view

formed by passing formed by passing a cutting plane a cutting plane entirely through an entirely through an object to reveal all object to reveal all of its interior of its interior features.features.

SECTIONAL VIEW

HALF SECTIONHALF SECTION This type of sectioning simply requires This type of sectioning simply requires

that a quarter of the object be removed to that a quarter of the object be removed to expose the interior features of the part.expose the interior features of the part.

BROKEN-OUT BROKEN-OUT SECTIONSECTION

It is a type of It is a type of sectioning wherein it sectioning wherein it often happens that often happens that only a partial section only a partial section of view is needed to of view is needed to expose interior expose interior shape and it is shape and it is limited by break line.limited by break line.

REVOLVED SECTIONREVOLVED SECTION It is a type of It is a type of

sectioning sectioning wherein the wherein the shape of the shape of the cross section of cross section of a bar, arm, or a bar, arm, or other elongated other elongated object may be object may be shown in shown in longitudinal longitudinal view.view.

REMOVED SECTIONREMOVED SECTION A removed section A removed section

is a section or is a section or partial section not partial section not directly projected directly projected from the view from the view containing the containing the cutting plane and cutting plane and not revolved or not revolved or turned from its turned from its normal normal  orientation. orientation.   

OFFSET SECTIONOFFSET SECTION It is a type of It is a type of

sectioning sectioning wherein the wherein the irregular irregular object is often object is often desirable to desirable to show the show the features that features that do not lie in do not lie in straight line.straight line.

ALIGNED SECTIONALIGNED SECTION It is a type of It is a type of

section section wherein it is wherein it is similar to off-similar to off-set sectional set sectional view.view.

It is used true It is used true projection projection would would confusing for confusing for ribs and holesribs and holes