Descriptive Geometry CH05 : SUCCESSIVE AUXILIARY VIEWS

Successive Auxiliary Views a chain of additional auxiliary views A primary auxiliary view projects from one of the 6 primary

views.

A secondary auxiliary is projected from a primary auxiliary

Construction of Successive Auxiliaries

1. Establish a LOS 2. Create a FP to the LOS 3. Transfer distances by

looking 2 views back (or

jump over 2 FPs)

Uses of Auxiliary & Additional Views

TL of a Line

1. Find the TL of the line by draw LOS (1.) to any view of the line.

Find the true clearance between the spherical tank with its center at O and the cylindrical pipe with center line XY.

Point View of a Line 2. LOS parallel to the TL of the line to show the

point view of the line.

Point View of a Line A line will appear as a point in any view for which the line of

sight is parallel to the line in space.

In order to produce a point view of a line, the line of sight must be parallel to a true-length view of the line.

Edge Views LOS is parallel to a TL view of a

line in the plane

FL is to the TL line in the plane When the EV is projected from

the Frontal view, you measure the True Angle () of the EV plane to the Frontal plane...

Normal View of a Plane A normal or true-size-&-shape (TS) view of a plane is obtained in

any view for which the line of sight is perpendicular to the EV of the plane.

When finding the EV, if there is no normal line, we can introduce a one (eh) to eliminate one view.

Normal View of a Plane FL is parallel to the EV Normal views allow for calculating area, location dimensions,

angles, diameters, etc..

Problem 5e. Determine the clearance between a 100 mm cylinder

established by its center line MN and a 150 mm diameter sphere having its center at point O.

PresenterPresentation Notes1. Find the TL of the line by drawing the LOS (1.) to any view of the line.2. Show the point view of the line by drawing the LOS parallel to the TL of the line.

Descriptive GeometrySuccessive Auxiliary ViewsConstruction of Successive AuxiliariesUses of Auxiliary & Additional ViewsTL of a LinePoint View of a LinePoint View of a LineEdge ViewsNormal View of a PlaneNormal View of a PlaneProblem 5e.