SECTION DRAWINGS

SECTION DRAWINGS

A section drawing shows detail on

the inside of an object by cutting

away part of the object.

FULL SECTION

Q: Why do we call this a “Full” section?

FULL SECTION

A: The cutting plane line cuts through the entire length,

height, or width.

CUTTING PLANE LINES•Cutting plane lines mark the point at which the object is to be

cut apart (wide double dashed line). Cutting plane lines must

be labeled by A-A or X-X or Y-Y.

Sight lines point to the part of the object that is to be kept.

CUTTING CUTTING

PLANE LINE

SIGHT LINE

FULL SECTION

No hidden lines on the sectional portion of a view

SECTION DRAWING

MISTAKES

HATCHINGHatching is used to show where the object has been cut. In

other words, if the part was cut with a saw, the hatching would

represent where the saw actually touched the object as it was

being cut.

The pattern of the hatching used represents different types of

materials. In the case above, a generic hatch has been used.

This generic hatch is sometimes used to represent iron or steel.

Hatch lines should match the color of the cutting plane line.

Hatch lines (.3mm)

HATCH PATTERNS

HATCHING MISTAKES

Hatching Exception

Web, Bolt, Nut, Shaft and Seal