Auxiliary views
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Auxiliary Views. Views Refresher. Three views are usually all that are needed to illustrate simple objects Top Front Right Sometimes only two views are necessary Cylinders. What’s a problem with these views when you’re working with circles?.

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Auxiliary Views

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Auxiliary views

Auxiliary Views


Views refresher

Views Refresher

  • Three views are usually all that are needed to illustrate simple objects

    • Top

    • Front

    • Right

  • Sometimes only two views are necessary

    • Cylinders


What s a problem with these views when you re working with circles

What’s a problem with these views when you’re working with circles?

  • A circle will look like an ellipse in the top, front, or right side view.


Sometimes the principal views do not work

Sometimes, the principal views do not work…

  • One example is when there is a circle or an inclined plane or some other special type of feature of the object.

  • Sometimes, we just need to show an object at an odd angle because there is something very specialized about the object that cannot be seen from the front, top or right side views.


Auxiliary view

Auxiliary View

  • A very special orthographic view that projects on any plane that is not one of the size primary views (front, back, top, bottom, left or right sides)

  • Perpendicular to the inclined part of the object

  • Circles really look like circles

  • The true length, true width, true depth, and true shape is shown


Why would we want to add another view

Why would we want to add another view?

  • We needed to show the true length of a line or a part or the point of view of some part of an object or edge

  • We needed to show the true shape and size of part of an object

  • We have a circle and need to draw the circle first to get the front or side or top view (sometimes called reverse construction)


The auxiliary view is parallel to the inclined surface and shows the true size and shape

The auxiliary view is parallel to the inclined surface and shows the true size and shape.


Steps to draw primary projections

Steps to Draw Primary Projections:


Steps to draw auxiliary view

Steps to Draw Auxiliary View:


Reference planes

Reference Planes

  • A reference plane is like the glass box projection

  • It is the edge of the related view

  • For example, if the reference plane is the front view, the auxiliary view will be projected out parallel from the inclined part as seen from the front view.

  • Consider this, the reference plan is the edge in the auxiliary view.


View classification

View Classification

  • An auxiliary view can be positioned anywhere around an object as the engineering designer chooses.

  • It is possible to then create additional auxiliary views from the auxiliary view.


View classification1

View Classification

  • These are classified as:

    • Primary – the first auxiliary view projected from one of the six principal views (top, front, sides, back, bottom)

    • Secondary – A single view projected from a primary auxiliary view

    • Tertiary – a single view projected from a secondary or another tertiary auxiliary view


Primary auxiliary views

Primary Auxiliary Views

  • Primary Auxiliary Views are also defined by the dimension that is shown in the true size

    • Depth – projected from the front view and the depth dimension is the true length

    • Height – projected from the top view and the height dimension is the true length

    • Width – projected from the side view and the width dimension is the true length


Primary views primary secondary tertiary auxiliary views

Primary Views & Primary, Secondary, & Tertiary Auxiliary Views

Depth (front), Height (top) & Width (side) Auxiliary Views

  • Are there any questions about these different views before we go forward?


Auxiliary views1

Auxiliary Views

  • Let’s make it easier on the engineering designer.

  • If there is a hidden part or something that is not inclined, we do not place it in an auxiliary view usually.

  • Also, we often only show the inclined part of the object which is called a partial auxiliary view.

  • This saves time and effort and is easier to view on a working drawing.

  • If the object is completely symmetrical, only half of the inclined part is drawn. This is called a half auxiliary.


Drawing a primary auxiliary view

Drawing a Primary Auxiliary View


Red construction lines are projected perpendicular to the inclined plane

Red construction lines are projected perpendicular to the inclined plane


Red construction lines are projected for the right and side views

Red construction lines are projected for the right and side views


Auxiliary views

Circle where the projected angle construction line crosses the top and side views. Draw a line connecting the two points. Then, draw a parallel line.


Draw arcs of the same radius and then draw lines parallel to front view

Draw arcs of the same radius and then draw lines parallel to front view


You can see how the true size and shape of the circle shows in the auxiliary view

You can see how the true size and shape of the circle shows in the auxiliary view


Clean it up no construction or projection lines dimension correctly

Clean it up. No construction or projection lines. Dimension correctly.


Now you can see why a partial auxiliary primary view is better

Now you can see why a partial auxiliary primary view is better…


Reminder

Reminder….

  • An auxiliary view is simply another view that shows something like true size and true shape that the principal views like top, front, and right side can not show.


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