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

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)

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.

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).

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

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

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.

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.

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

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