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Hidden lines in a drawing represent the edges where surfaces meet but are not directly visible. Draw centerlines locating the center of a hole only if they are needed to indicate symmetry or for dimensioning. In general, use centerlines sparingly in isometric drawings.
Do you put centerlines on hidden lines?
They should be present to convey the shape, even in a view where they are shown as hidden, because that is good practice relative to standards. Dragging centerlines to make them randomly makes them look like crap.
Do you draw hidden lines in isometric drawings?
Usually only the visible surfaces of an object are drawn in isometric, with hidden lines left out. Although this is considered the preferred practice, there are always times when hidden lines are needed to clarify very complex isometric drawings.
How do you show hidden lines in a drawing?
To show or hide hidden edges in the Drawing View Properties dialog box: Right-click the drawing view and select Properties. Select the Show Hidden Edges tab.
When can centerlines be used as extension lines?
A center line may be extended and used as an extension line, in which case it is still drawn like a center line. 25. Center lines should generally not extend from view to view.
What is the purpose of hidden lines and centerlines?
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.
Where do you put hidden lines?
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.
What do hidden lines in orthographic projection?
What do hidden lines in orthographic projections denote? Explanation: Hidden lines denote those parts which cannot be seen when viewing the object. They are used when there are holes or slots in the object if they cannot be viewed directly. Change of plane is indicated by outlines.
How do you make hidden lines visible in Inventor?
Solution: Right-click the view. Click in the drop-down menu Edit View In the dialog box Drawing View click on the Hidden Line button. If you see this icon. , it means that you have activated the checkbox on Style above the buttons. After clicking the OK button, you should see the hidden lines, in the view(s).
What is a phantom line?
Lines that are made visible as dots or dashes to reveal the edges of objects currently hidden from view.
How do I make hidden lines visible in Autocad?
Show Hidden Lines in the Current Viewport Select the viewport in which you want to show hidden lines. Click View tab Palettes panel Properties palette. On the Properties palette, under Misc, in the Shade Plot field, select As Displayed.
Are hidden lines required?
Hidden lines in a drawing represent the edges where surfaces meet but are not directly visible. Hidden lines are omitted from pictorial drawings unless they are needed to make the drawing clear. Figure 3.46 shows a case in which hidden lines are needed because a projecting part cannot be clearly shown without them.
Can hidden lines overlap?
The overlapped areas of the objects that lie behind (referred to as the background) are drawn as hidden lines. Objects overlapping each other this manner are said to be involved in a “hide situation”. Any closed contour on a contour layer or a non-mechanical layer can be selected as a foreground object.
What does a hidden line look like?
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.
Are centerlines only used for circles?
Centerlines indicate a circular feature on a drawing. The cross-section view shown in figure 2 can help clarify this; without the centerlines, the ‘holes’ would be considered rectangular in this part rather than circular. Centerlines are used as a reference to dimension circular features.
What are the correct ways to draw extension lines?
When drawing an extension line, you should leave a 1/16-inch gap between the outline of an object and the beginning of an extension line. Extension lines will extend another 1/8-inch beyond the outermost dimension line.
What dimensions should write on dimension line?
Dimensions should be written on a drawing, according to one of the following two methods. Only one method should be used on any one drawing. Dimensions should be placed parallel to the dimension lines and preferably near the middle, above and clear off the dimension line (Fig.
What are the benefits of using an isometric sketch to communicate a design *?
The advantages to using isometric pictorial is that it enables to sketcher to easily draw the objects they are sketching when it involves them being positioned in an angle. It also works well for sketching the depth, width, and height of an object easier with how the lines are angled on the sheet.
Why is oblique drawing used?
Oblique projections Oblique drawings are not very realistic as it is impossible to see the front of an object straight on and the side at the same time. They can be useful to sketch at speed or to show the front and side of a building.
What do you call the thin and dark line used to show the starting and ending of dimension?
EXTENSION LINE – Thin and dark line use to show the starting and ending of dimension.
When hidden lines meet their dashes should?
Creating Hidden Lines Rule 2: Hidden lines should always begin and end with a dash. An exception is when the hidden line begins or ends at a parallel visible or hidden line.
What are the 3 regular views of an object?
An orthographic projection normally contains three views of the object: the front view in the lower left corner, the top view in the upper left corner, and the right side view in the lower right corner.
What is a hidden line in AutoCAD?
AutoCAD Mechanical toolset automatically creates hidden lines when you specify which objects overlap the others. The overlapped areas of the objects that lie behind (referred to as the background) are drawn as hidden lines. Objects overlapping each other this manner are said to be involved in a “hide situation”.
What is the purpose of construction lines object lines?
What is the purpose of construction lines? Object lines? Construction lines are used to guide where you will draw your object lines to form lines and shapes. Object lines are what compose the shape/figure.
