What is the purpose of the arrowheads on a cutting plane line?

Nniu

Updated: 28th November 2019

The section produced by cutting through the entire object is called a full section, as shown in fig. (c) below. The cutting-plane line is shown as a special pattern. The arrows at the ends of the cutting plane line indicate the direction of sight for the section view.

Keeping this in consideration, what is the purpose of a section line?

A section view is a view used on a drawing to show an area or hidden part of an object by cutting away or removing some of that object. The cut line is called a “cutting plane”, and can be done in several ways.

What is the purpose of a dimension line?

The dimension line is a thin line, broken in the middle to allow the placement of the dimension value, with arrowheads at each end (see diagram below). An arrowhead is approximately 3 mm long and 1mm wide. That is, the length is roughly three times the width.

What is a section lining?

Section lining, sometimes referred to as cross-hatching, is used to indicate material in the sectioned part. Most often, the general purpose section lining symbol is used to represent any material. The exact type of material used to produce the object is usually given as a note somewhere else in the drawing.
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