The arrows at the ends of the cutting plane line indicate
the direction of sight for the section view
. … When a cutting-plane line coincides with a centerline, the cutting-plane line takes precedence.
What do the arrows in a cutting plane line indicate?
The arrows at the ends of the cutting plane line indicate
the direction of sight for the section view
. … When a cutting-plane line coincides with a centerline, the cutting-plane line takes precedence.
What is the difference between section lines and cutting plane lines?
CUTTING PLANE LINES are used to indicate a plane or planes in which a
sectional view
is taken. Section views are used to give a clearer view of the interior or hidden feature of an object that normally cannot be clearly observed in conventional outside views.
What is the difference between a full section view and a half section view?
This is the most common section (called a full section) with the imaginary laser cutting a line across the entire construction, offering a view of a portion of the building with the rest of it put to one side. Half sections or views. In this type of section, only half of the space or object is
cut away
.
Section views do not include hidden lines
. Any material cut when a section view is defined is hatched using section lines. There are many different styles of hatching, but the general style is evenly spaced 45° lines.
What is the purpose of a cutting plane line and its arrows in sectioning?
Cutting plane lines are thick (. 7mm) dashed lines, that extend past the edge of the object 1/4′′ or 6mm and have line segments at each end drawn at 90 degrees and terminated with arrows.
The arrows represent the direction of the line of sight for the section view and they point away from the sectioned view.
What is a section line in drafting?
Section Lines:
Used to indicate where the cutting plane cuts the material
. Section lines are thin and the symbols (type of lines) are chosen according to the material of the object. Section lines are generally drawn at a 45° angle.
What are the 7 types of section views?
There are a number of different types of sectional views that can be drawn. A few of the more common ones are:
full sections, half sections, broken sections, rotated or revolved sections, removed sections, offset sections, and assembly sections
.
What are the 12 types of lines?
- Object lines. shows the contour or outline of objects.
- Hidden lines. represents features that are hidden in current view.
- Centerlines. locates the center of circles and arcs.
- Extension lines. show the extinct of a dimension.
- Dimension lines. …
- Leader lines. …
- Cutting-plane lines. …
- Viewing-plane lanes.
What are alphabet lines?
Line symbols used in technical drawing
are often referred to as ALPHABET OF LINES. The use of line symbols enables engineers/designers to express the features of designed products clearly and accurately. Line features vary not only by width but also by how they are graphically represented in a drawing.
When and why is a section view necessary?
In which case,
the direction of sight is towards one half of the object
. The other half is then mentally discarded. Drafters use sectional views to improve the clarity of complex objects when internal surfaces result in too many hidden lines. Special conventions are used to make a sectional view easy to understand.
How do you read a section view?
When sketching an object or part that requires a sectional view, they are
drawn by eye at
an angle of approximately 45 degrees, and are spaced about 1/8” apart. Since they are used to set off a section, they must be drawn with care. It is best to use the symbol for the material being shown as a section on a sketch.
What types of sectioning is limited by a broken line?
- A. Removed section.
- Revolved section.
- Broken-out section.
- Half section.
The purpose of hidden lines is to show hidden features.
If a section exposes the hidden features, no hidden lines are required
. Why are some symmetrical features, like spokes and webs, revolved in the sectional view?
What is a removed section view?
So, what is it? The removed section view is
a zero-thickness slice through the model showing only cut edges and hatching perpendicular to the cutting line
. That's different than the traditional section view, which is projected parallel to the cutting line.
What are the parts not usually sectioned?
In addition to thin structural features, parts not sectioned also include standard mechanical elements such as
shafts, bolts, screws, nuts, rivets, keys, pins, bearings, and gear teeth
. The shaft, bolts, and nuts of the assembly are not sectioned even though they are cut by the cutting plane.
