12” (3.0mm). Usually, all visible edges behind the cutting plane should be shown. In a half section, 1⁄4 of the object is imagined to be cut away. In a full section, 1⁄2 of the object is imagined to be cut away.
Is used that passed halfway through an object which results to a half section?
If the cutting plane is passed halfway through an object, and one-quarter of the object is removed, the resulting section is a half section. A half section has the advantage of showing both inside and outside configurations. It is frequently used for symmetrical objects.
When half portion of an object is removed then it is called?
Explanation: If the cutting plane for full length or half length of the object removes the external features, then the cutting panes used for a small portion. The portion is called a partial section or broken out section .
What does the cutting plane line represent?
The cutting-plane line represents edge view of the cutting plane , in order to show the inside features of the object. The arrows indicate the viewing direction.
What is a half section view?
A half-section is a view of an object showing one-half of the view in section . Half Section. • Symmetrical parts can be shown in half sections.
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 is short break line?
Short break lines are thick, wavy solid lines that are drawn freehand . When either of these break lines is used to shorten an object, you can assume that the section removed from the part is identical to the portions shown on either side of the break.
What is a phantom line?
Lines that are made visible as dots or dashes to reveal the edges of objects currently hidden from view .
What is dimensional line?
The dimension line is a fine, dark, solid line with arrowheads on each end. It indicates direction and extent of a dimension . In machine sketches and drawings, in which fractions and decimals are used for dimensions, the dimension line is usually broken near the middle to provide open space for the dimension numerals.
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. Section Line.
What is a section view?
What is a section view? A sectional view or a section looks inside an object . Sections are used to clarify the interior construction of a part that cannot be clearly described by hidden lines in exterior views. ... The unwanted portion is mentally discarded exposing the interior construction.
What is full section and half section?
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.
What is a broken out section view?
A broken-out section view cuts away a portion of an assembly in a drawing view to expose the inside . ... A broken-out section is part of an existing drawing view, not a separate view. A closed profile, usually a spline, defines the broken-out section. Material is removed to a specified depth to expose inner details.
When should a full section be used?
This type of section is used for both detail and assembly drawings . When the cutting plane divides the object into two identical parts, it is not necessary to indicate its location.
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.
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.
