Where in a drawing a Centre line is used?
Centre lines are drawn to indicate the exact centre of a component being drawn. They are made from a series of lighter long and short dashes. Section lines are special lines placed on a drawing which indicate the area of the drawing through which an imaginary cut has been made to reveal internal details.
Which line is used for Centre line?
Chain thin double dash Used for centre lines, lines of symmetry. Chain thin thick at both ends and changes in direction Used on Cutting planes. Used as the limit to an interrupted view when an axis is not present. Notice on the above drawing that the largest dimension is placed on the outside of the smaller dimensions.
What is center line in drawing?
A centerline is created between the apparent midpoint of the start and endpoints of the selected two lines. When selecting nonparallel lines, the centerline is drawn between the imaginary intersection point and the endpoints of the selected lines. The centerline bisects the angles of the two intersecting lines.
How do you use a centerline?
To add a center line select the Centerline tool from Centerlines panel of Annotate tab and click on the two lines. The center line will be automatically added in between the selected lines. If the lines are intersecting then the center line will pass through the angle bisector of the lines as shown in the image below.
What is the purpose of a center line?
What are Centerlines? Centerlines are one of the most frequently used tools in engineering drawing. Their basic purpose is to show circular/cylindrical features in a drawing, which are found in abundance in mechanical parts. Common examples of such features include bolt holes, pins, discs, etc.
Can you dimension from a centerline?
Dimensions should be given to finished surfaces or between important center lines (not to rough surfaces) wherever possible.
What type of line should you avoid dimensioning to?
Dimension lines should not cross, if avoidable. Dimension lines and extension lines should not cross, if avoidable. Extension lines may cross each other. When extension lines cross extension lines or visible lines, no break in either should be made.
What are the do’s and don’ts of dimensioning?
Dimensioning Rules Avoid placing any dimensions on the part (inside the view) unless there is no other option. Avoid dimensioning to hidden features Always place the dimension where the characteristic shape is shown in the most descriptive view. (This means don’t place a dimension on object lines making a “T joint”.)
What are hidden lines in drawing?
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.
Which line is used for free hand drawing?
1. Sketching of Straight Lines. The line is the most important part of free hand drawing as sketching is done by different lines. Straight lines can be divided into different lines such as oblique, horizontal, and vertical lines.
What is line weight in drawing?
Line weight is the visual lightness, darkness, or heaviness of a line within a drawing. In any architectural drawing, from a sketch to a construction drawing, the interplay of different relative line weights is used to communicate depth, importance, and proximity.
What are the types of lines in drawing?
There are 5 main types of lines in art: vertical lines, horizontal lines, diagonal lines, zigzag lines, and curved lines. Other types of lines are simply variations of the five main ones.