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If the cutting plane appears as an edge in the top and front views and the profile view is sectioned, it is a profile cutting plane. In the drawing you must show the cutting plane line either on front view (with the top sectioned view) or on top view (with the frontal section view), not on both.
- Cutting Plane. A surface cut by the saw in the drawing above is a cutting plane. Actually, it is an imaginary cutting plane taken through the object, since the object is imagined as being cut through at a desired location.
- Cutting Plane Line. A cutting plane is represented on a drawing by a cutting plane line. This is a heavy long-short-short-long kind of line terminated with arrows.
- Section Lining. The lines in the figure above, which look like saw marks, are called section lining. They are found on most sectional views, and indicate the surface which has been exposed by the cutting plane.
- Full Sections. When a cutting plane line passes entirely through an object, the resulting section is called a full section Fig. 7 illustrates a full section.
- Full Sections. A Full section view is where the entire part or assembly is cut on a single plane. The generated section view that is created may form part of the same view as the reference view, permitted the correct projection method (first or third angled projection) is used.
- Half Section. The half section view may be used where a part or assembly is symmetrical about the centerline of the part or assembly. This will save space on the drawing with over population of reference and section views.
- Partial Section. A Partial section is used when only a certain portion of a part or assembly is cut in order to show important detail or geometry. The whole part or assembly is not sectioned as that may minimize the other information show.
- Revolved Section. A revolved section is a section that is made at a certain point in a part and revolved 90° to show the cross section of the part. The part can be broken to show the revolved section or the revolved section can be superimposed on the part itself.
The viewing direction is irrelevant since the section is symmetric about its center line. In the case of a removed section, the section view is shown above or below the cutting line. In other instances, you might need to put a section view somewhere else on the drawing for space or clarity reasons.
Lines used in section views. Cutting Plane Line: Used to show where the object is being cut. (Phantom line type) 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 used to show the cut surfaces of an object in section views. They are fine, dark lines. Various types of section lines may indicate the type of material cut by the cutting plane line.
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Section Lines. Section lines on a drawing indicate a surface that has been cut or sliced in a section view. Section lines are thin lines drawn parallel to each other at a 45-degree angle and spaced evenly at 1/16″ (1.6 mm) apart to 1/8″ (3 mm) apart. Section lines are also referred to as hatching.