What is phantom line in drawing?
Phantom lines are long-short-short-long lines most often used to show the travel or movement of an object or a part in alternate positions. It can also be used to show adjacent objects or features. Border Line.
What are the lines used in engineering drawing?
Following are the different types of lines used in engineering drawing:
- A type – Continuos Thick.
- B type – Continuous THIN.
- C type – Continuous THIN Freehand.
- D type – Continuous THIN Zig-Zag.
- E type – Dashes THICK.
- F type – Dashes THIN.
- G type – Chain Thin.
- H type – Chain THIN and THICK.
What are the rules of dimensioning drawing?
1. Each dimension should be given clearly, so that it can be interpreted in only one way. 2. Dimensions should not be duplicated, or the same information given in two different ways, and no dimensions should be given except those needed to produce or inspect the part.
What is double dimensioning?
Dual dimensioning is the drafting practice of using multiple units of measure in a dimension in the same direction of a feature.
What is a thin line with arrowheads on each end called?
The dimension line is a thin line, broken in the middle to allow the placement of the dimension value, with arrowheads at each end (see diagram below).
Which line on a drawing should be the thickest?
The direction of the cutting line is shown with a line called a cutting plane lineHeavy dashed line that shows a theoretical cut through an object.. This is the thickest line that may appear on a drawing. It is made up of a series of 3/4″ long (19mm) and double lines 1/8″ (3.2mm) long that are about 0.040″ (1mm) thick.
What do you call a heavy line that is drawn freehand?
Long break line – Heavy line draws freehand for same purpose as long break.
Why line weight is important in technical drawing?
When your drawings need to communicate a lot of different and often overlapping information, clarity is key. Using different line weights allows you to distinguish one type of information from another, and to guide how the eye moves around the drawing – both elements which are key to achieving legibility and clarity.
What is the difference between the section line and the center line?
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.
What should Leader lines never do?
Leader lines should never cross one another, nor should they be parallel or nearly parallel to nearby dimensions, extension, or cross-hatching lines.
When a solid is placed on HP?
Only one position in which a cylinder or a cone may be placed with its base on HP. When a solid is placed with its axis perpendicular to VP, the base of the solid will always be perpendicular to HP and parallel to VP.
What is the difference between nomenclature of HP and VP?
HP: The plane which is Horizontal and perpendicular to VP is Horizontal Plane. Note: The planes HP and VP are called Principal Planes. Reference Line: The line of intersection of HP and VP is called reference line, which is denoted by X-Y.
When a point is above HP and VP it is in?
Projection of Points • There are basically nine type of projections of point is space : 1. In FIRST Quadrant (Above H.P. , In front of V.P.) 2. In SECOND Quadrant (Above H.P. , Behind V.P.) 3. In THIRD Quadrant (Below H.P. , Behind V.P.) 4.
Can a plane be parallel to both HP and VP?
ORIENTATIONS OF PLANES Surface of plane is parallel to the H.P. (and perpendicular to the V.P.). 2. Surface of plane is parallel to the V.P. (and perpendicular to the H.P.).
When the projectors are parallel to each other and also perpendicular to the plane is called?
Explanation: In orthographic projection, the projectors are parallel to each other and also perpendicular to the plane but in oblique projection, the projectors are inclined to the plane of projection and projectors are parallel to each other. 3. Explanation: Oblique projection is one method of pictorial projection.
When a plane is parallel to VP and perpendicular to HP and PP always first?
Whereas if a plane is parallel to h.p and perpendicular to v.p, then pp is always back view (BV) first.
When the drawings are drawn smaller than the actual size of object then scale is known as?
Explanation: The representative fraction 1:3 indicates that the dimension of the drawing is one-third of the actual object. Since the drawing is smaller than the actual object, this type of scale is called a reducing scale.
What is done to make the trace horizontal?
Explanation: As the line cuts the horizontal plane the projection of that line on horizontal plane coincides from top view and so the horizontal trace which is the point formed by cutting the line with horizontal plane also coincides with the corresponding projection end.
Is a Plane a flat surface?
In mathematics, a plane is a flat, two-dimensional surface that extends infinitely far. A plane is the two-dimensional analogue of a point (zero dimensions), a line (one dimension) and three-dimensional space.