Types Of Lines In Engineering Drawing

Types of Lines in Engineering Drawing

Engineering drawings, also known as technical drawings, are used to design and document any type of mechanical, electrical, or structural system. The drawing must be precise, clear, and accurate in order to effectively communicate the desired design. For this reason, there are a variety of lines used to create the drawing. In this article, we’ll explore the different types of lines used in engineering drawings.

Object Lines

Object lines, sometimes referred to as visible lines, are the main outlines of an object or component. They are drawn in the thickness of the line that is seen in the finished product. This line thickness can range from 0.13mm to 0.25mm. Object lines are used to identify the exact shape and size of the object.

Hidden Lines

Hidden lines, also referred to as phantom lines, are used to represent the hidden features of an object. This type of line is used to represent features that would be hidden from view in the finished product. They are drawn using dashed lines of varying lengths. For example, a hidden line could be used to represent a hole in a component that would not be visible without taking the component apart.

Center Lines

Center lines are used to represent the center of an object or component. They are drawn using a dashed line with alternating long and short dashes. Center lines are used to indicate the middle of a circle or the center of a hole. They can also be used to indicate the center of a symmetrical object.

Dimension Lines

Dimension lines are used to indicate the size of an object or component. They are drawn as a solid line with arrows on each end. The arrows are used to indicate the beginning and end of the dimension. The dimension is usually written next to the line. The dimension is typically written in a unit of measure, such as millimeters or inches.

Section Lines

Section lines are used to indicate the sections of a component or object. They are drawn using a solid line with a series of small circles along the line. The circles are used to indicate where the section view begins and ends. A section view is used to show the internal features of a component or object without having to take it apart.

Cutting Plane Lines

Cutting plane lines are used to indicate the direction of a section view. They are drawn using a solid line with a series of alternating long and short dashes. The alternating dashes are used to indicate the direction of the section view. A section view is used to show the internal features of a component or object without having to take it apart.

Construction Lines

Construction lines are used to provide a reference for the construction of an object or component. They are drawn using a thin dashed line. They are typically used to indicate the location of an object or component. They are also used to indicate the size and location of a hole. Construction lines are usually removed from the final drawing.

In conclusion, there are a variety of lines used in engineering drawings. Object lines are used to identify the exact shape and size of the object. Hidden lines are used to represent the hidden features of an object. Center lines are used to represent the center of an object or component. Dimension lines are used to indicate the size of an object or component. Section lines are used to indicate the sections of a component or object. Cutting plane lines are used to indicate the direction of a section view. And construction lines are used to provide a reference for the construction of an object or component.