1. What is a working drawing and what is orthographic projection?
Drawings which contain all the information needed to make the object you
have designed, including dimensions and details of components, materials
and assembly instructions, are called working drawings. The normal drawing
technique for working drawings is orthographic projection

2. This is first angle projection It is commonly used in Europe and Asia
(Think of an actor on a stage)
The images are the same they are
Just located in different places on the
Paper.
This is third angle projection
It is commonly used in the US and Canada
(Think of a fish in a tank)

3. Orthographic projection shows complex objects by doing a 2D drawing of
each side to show the main features. Orthographic drawings usually consist
of a front view, a side view and a plan (top view), but more views may
be shown for complex objects with lots of detail.

5. Isometric projection is a form of graphical projection
Isometric projection is a form of graphical projection. It is a method of visually representing three-dimensional objects in two dimensions, in which the three coordinate axes appear equally foreshortened and the angles between any two of them are 120°. Isometric projection is one of the projections used in drafting engineering drawings.
The term isometric comes from the Greek for "equal measure", reflecting that the scale along each axis of the projection is the same (this is not true of some other forms of graphical projection).

7. Top view (sometimes called Plan View)
Right Side view
Dashed lines are hidden objects
Front View

22. Dimension lines are thinner than object lines
They are drawn at right angles to the distance dimensioned
There should be a visible gap between the object and the
Extension line.
Avoid crossing dimension lines. Place dimension off the object and group them when possible

23. Holes should be specified with a note. If two or more
identical holes exist, one note can be used as shown
Holes notes should be placed On the view where the hole appears
as a visible circle. The leader line should extend radially from the circle
touching its circumference.The hole dimension should be preceded by a
diameter symbol.

24. Avoid dimensioning to invisible lines whenever possible.
Some general rules:
Try to dimension to the best profile view of the
Feature.
Dimensions locating holes should be given to both of the
Two center lines that intersect at the hole center. Do not
Dimension to the hole edge.
Do not repeat dimensions on the same or
Other views.

30. Use Auxiliary views when none of the normal views show the true size and
Shape of a feature.

39. This workforce solution was funded by a grant awarded by the U. S
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