- 1 What is the purpose of construction lines object lines quizlet?
- 2 What is the main purpose of hidden lines and center lines?
- 3 What is the purpose of hidden lines?
- 4 What are center lines?
- 5 What are construction lines?
- 6 What are leader lines?
- 7 How do you use hidden lines?
- 8 Why should you not erase construction lines?
- 9 What do you understand by thickness of lines?
- 10 Which lines on a drawing should be the thickest?
- 11 What type of lines are used for hidden details?
- 12 How do I find hidden lines in an object?
- 13 What are alphabet lines?
- 14 What do center lines look like?
- 15 What should Leader lines never do?
What is the purpose of construction lines object lines quizlet?
The purpose of construction lines is to give you an outline of what you are about to draw. Object lines are used for outlining the shape and giving it its main features.
Hidden lines show edges of details that are not visible from the point of view shown in the drawing. Center lines define the center of arcs, circles, or symmetrical parts.
A hidden line, also known as a hidden object line is a medium weight line, made of short dashes about 1/8” long with 1/16”gaps, to show edges, surfaces and corners which cannot be seen. Sometimes they are used to make a drawing easier to understand. Often they are omitted in an isometric view.
What are center lines?
A centerline is created between the apparent midpoint of the start and endpoints of the selected two lines. The centerline bisects the angles of the two intersecting lines. In this example, the location of the pick points defines the direction of the centerline.
What are construction lines?
Construction lines (also known as xlines) are temporary linework entities that can be used as references when creating and positioning other objects or linework. For example, you can use construction lines to prepare multiple views of the same item, or create temporary intersections to serve as object snaps.
What are leader lines?
A leader line is a line that establishes a connection between a graphical representation of an item and some text. A leader points to a bit of our drawing and says: A leader line also has a terminator and some text. A leader line may have a reference line under the text.
Hidden lines are used to show surfaces that are not directly visible. All surfaces must be shown in all views. If an edge or surface is blocked from view by another feature, it is drawn using a hidden line. Figures 4-11 and 4-12 show objects that require hidden lines in their orthographic views.
Why should you not erase construction lines?
Construction lines should not be erased, because construction lines serve as a guide for you and for your drawing. Construction lines are used as references in positioning objects or other lines in your work. Construction lines must be easily seen and easy to be erased.
What do you understand by thickness of lines?
This section deals with line thicknesses definition. Line thicknesses is a property which can be applied to, and drives the representation of, almost all elements in a drawing, such as lines, curves, dimension lines, etc. (Line thickness cannot be applied to fonts and points).
Which lines on a drawing should be the thickest?
The direction of the cutting line is shown with a line called a cutting plane lineHeavy dashed line that shows a theoretical cut through an object.. This is the thickest line that may appear on a drawing. It is made up of a series of 3/4″ long (19mm) and double lines 1/8″ (3.2mm) long that are about 0.040″ (1mm) thick.
Hidden details are shown by a series of dashes making up a broken line. It is normal practice that you place a dash at the beginning of the hidden line and another at the end where it meets an intersecting line.
A drafter—in deciding whether a line in a view should be represented as hidden or as visible—relies on the fact that in third-angle projection the near side of the object is near the adjacent view, but in first-angle projection the near side of the object is remote from the adjacent view.
What are alphabet lines?
The Alphabet of Lines is a list of line symbols that engineers use in technical drawings to communicate specific shapes, sizes or surfaces. The lines and symbols used in the Alphabet of Lines are universal, which means engineers around the world use and understand them.
What do center lines look like?
Center lines denote a circular feature such as a shaft or a hole. A rectangular feature seen on an elevation of a drawing could be identified either as a circular feature or a rectangular feature. If the center line is removed, the two features are identical.
What should Leader lines never do?
Leader lines should never cross one another, nor should they be parallel or nearly parallel to nearby dimensions, extension, or cross-hatching lines.