multiview sketching and projection - union collegetchakoa/mer101/orto_projection2.pdf · multiview...

MULTIVIEW SKETCHING AND PROJECTION

View of Objects: In engineering graphics a view of an object is created by orthographic projection. In Orthographic projection, rays (or projectors) from all points on the edges or contours of the object extend parallel to each other and perpendicular to the plane of projection.

Visually views of objects are obtained by looking perpendicularly in the direction of the arrows shown on the following isometric drawings.

A fixed object can be looked at from six different positions:

- Front, - Top, - Bottom, - Right, - Left, and - Back (or Rear).

The object can also be turned and revolved to look at and produce the six basic views as in following

Fixed or turned the object will yield the following projected views. To make the drawing easier to read, the views must be arranged on the paper according to the drafting standard.

SIX VIEWS but mostly only three needed.

THE GLASS BOX METHOD: One way to understand the standard arrangement of the views on the sheet paper is the glass box.

Unfolding the Glass box:

1) Think of all the planes except the rear plane as hinged to the frontal plane. (The rear plane is usually hinged to the left side plane).

2) Each plane folds out away from the frontal plane.

Glass Box Unfolded: The positions of these six planes after they have been unfolded give the standard arrangement of the views of the object.

VIEWS LAYOUT.

TRANSFERRING OF DEPTH DIMENSIONS.

STEPS IN SKETCHING VIEWS.

SPACING BETWEEN VIEWS.