Đang chuẩn bị liên kết để tải về tài liệu:
Lecture Autodesk inventor: Auxiliary views

An auxiliary view is an orthographic view that is projected onto any plane other than the frontal, horizontal, or profile plane. An auxiliary view is not one of the six principal views. To show the true size and shape of surface ABCD, an auxiliary view can be created by positioning a line of sight perpendicular to the inclined plane, then constructing the new view. | Auxiliary Views Motivation One view of the surface seen on edge Two views seen as a foreshortened (i.e., not true size) surface Multiview drawing set of an inclined surface shows: Sometimes need a view of inclined surface that shows its true size and shape From Descriptive Geometry Line of sight is normal to the face, or, equivalently, View plane is parallel to the face True size and shape of a planar face (or true length of a line) can only be represented in an orthographic projection if: Definitions An auxiliary view is an orthographic view that is projected onto any plane other than one of the principal planes A primary auxiliary view is an auxiliary view projected from one of the six principal views Used to find true size of an inclined surface A secondary auxiliary view is a view projected from a primary auxiliary view Used to find true size of an oblique surface Auxiliary View Projection Theory - 1 Object with inclined surface placed inside glass box Additional plane added to glass box - parallel to inclined surface Inclined surface projected onto inclined plane Auxiliary View Projection Theory - 2 Inclined projection plane hinged to principal projection plane (Horizontal, Frontal, Profile) that shows inclined surface as an edge Auxiliary View Projection Theory - 3 Views unfolded - auxiliary view shows true size and shape of inclined surface Distance from hinge to edge of inclined surface same for all views, principal or auxiliary Convention is to only show inclined surface in an auxiliary view Auxiliary Views: 3 Cases Depending upon where the inclined surface appears on edge, primary auxiliary views can be projected from either the: Horizontal Plane Frontal Plane Profile Plane Auxiliary Views Over and . | Auxiliary Views Motivation One view of the surface seen on edge Two views seen as a foreshortened (i.e., not true size) surface Multiview drawing set of an inclined surface shows: Sometimes need a view of inclined surface that shows its true size and shape From Descriptive Geometry Line of sight is normal to the face, or, equivalently, View plane is parallel to the face True size and shape of a planar face (or true length of a line) can only be represented in an orthographic projection if: Definitions An auxiliary view is an orthographic view that is projected onto any plane other than one of the principal planes A primary auxiliary view is an auxiliary view projected from one of the six principal views Used to find true size of an inclined surface A secondary auxiliary view is a view projected from a primary auxiliary view Used to find true size of an oblique surface Auxiliary View Projection Theory - 1 Object with inclined surface placed inside glass box Additional plane added to glass box - parallel to inclined surface Inclined surface projected onto inclined plane Auxiliary View Projection Theory - 2 Inclined projection plane hinged to principal projection plane (Horizontal, Frontal, Profile) that shows inclined surface as an edge Auxiliary View Projection Theory - 3 Views unfolded - auxiliary view shows true size and shape of inclined surface Distance from hinge to edge of inclined surface same for all views, principal or auxiliary Convention is to only show inclined surface in an auxiliary view Auxiliary Views: 3 Cases Depending upon where the inclined surface appears on edge, primary auxiliary views can be projected from either the: Horizontal Plane Frontal Plane Profile Plane Auxiliary Views Over and Out