Example Engineering Drawing

engineering drawing is to convey all the necessary information of how to make the part to the manufacturing department. For most parts, the information cannot be conveyed in a single view. Rather than using several sheets of paper with different views of the part, several views can be combined on a single drawing using one of the two available projection systems, first angle, and third angle projection.

With first angle projection, the view you are looking at is projected through to the other side of the object. So if we are drawing the three visible sides of the object illustrated in first angle projection, we are drawing the views projected on the other side of the object and not three nearest views.

Hatching

On sections and sectional views solid area should be hatched to indicate this fact. Hatching is drawn with a thin continuous line, equally spaced (preferably about 4mm apart, though never less than 1mm) and preferably at an angle of 45 degrees.

Hatching a single object

When you are hatching an object, but the objects has areas that are separated, all areas of the object should be hatched in the same direction and with the same spacing.

Hatching Adjacent objects

When hatching assembled parts, the direction of the hatching should ideally be reversed on adjacent parts. If more than two parts are adjacent, then the hatching should be staggered to emphasise the fact that these parts are separate.

Reverse hatching

Hatching thin materials

Sometimes, it is difficult to hatch very thin sections. To emphasise solid wall the walls can be filled in. This should only be used when the wall thickness size is less than 1mm

.

Hatching large areas

When hatching large areas in order to aid readabilty, the hatching can be limited to the area near the edges of the part.

Hatching thin materials

Sometimes, it is difficult to hatch very thin sections. To emphasise solid wall the walls can be filled in. This should only be used when the wall thickness size is less than 1mm

.

Hatching large areas

When hatching large areas in order to aid readabilty, the hatching can be limited to the area near the edges of the part.