Table of Contents
What are the rules of dimensioning in a drawing?
Rule 1) Dimensions should be arranged for maximum readability. The spacing between dimension lines should be uniform throughout the drawing. Do not dimension inside an object or have the dimension line touch the object unless clearness is gained.
Can dimensions come from opposite sides of a view?
Dimensions should not be placed upon a view (unless clearness is promoted thereby). 10. Dimensions applying to two adjacent views should be placed between views, unless clearness is promoted by placing them outside.
What are the rules that must be followed while dimensioning?
Dimensions should NOT be duplicated, or the same information given in two different ways. Don’t over-‐define or under-‐define the object. 2. No unnecessary dimensions should be used – only those needed to produce or inspect the part.
Can dimension lines cross?
Dimension lines should not cross, if avoidable. Dimension lines and extension lines should not cross, if avoidable. Extension lines may cross each other. When extension lines cross extension lines or visible lines, no break in either should be made.
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.
Is it an acceptable practice to over dimension in a part drawing?
size and location of features on parts for manufacture. The basic criterion is, “What information is necessary to make the object?” Dimensions should not be excessive, either through duplication or dimensioning a feature more than one way. might be the overall width of the part or the diameter of a drilled hole.
Which is the wrong statement regarding dimensions?
3. Which is the wrong statement regarding dimensions? Explanation: There is no such rule that the dimensions should be placed only on left side of drawing because it may not possible to represent every dimension only on left side.
What do dimension lines end with?
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.
Why are dimensioning rules necessary?
The purpose of dimensioning is to provide a clear and complete description of an object. A complete set of dimensions will permit only one interpretation needed to construct the part. Dimensioning should follow these guidelines.
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 you draw a parallel dimension?
To draw a parallel dimension line, click the Parallel dimension tool in the toolbox. To draw a vertical or horizontal dimension line, click the Horizontal or vertical dimension tool . Click to place the starting point, and drag to where you want to place the endpoint of the dimension line.
What are the 3 types of drawing dimensions?
The basic types of dimensioning are linear, radial, angular, ordinate, and arc length.
What are typical dimension line terminators called?
Arrowheads are typical dimension line terminators. There are other acceptable dimension line terminators. Arrowheads point directly to the object that is being dimensioned or the extension lines at the end of the dimension.
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. (thin and long with a zigzag) (thick and short, wavy freehand).
What is a hidden line?
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.
What are the two systems of placing dimensions on a drawing?
Explanation: The two systems of placing dimensions are aligned system and unidirectional system. In the aligned system, the dimension is placed perpendicular to the dimension line.
What does nonfunctional dimension mean?
NON-FUNCTIONAL DIMENSIONS. Non-functional dimensions, NF in Figure 4.1, are those dimensions which are used for production purposes but which do not directly affect the function or working of a product. Non-functional dimensions usually are not inspected.
What is combined dimensioning?
The type of dimensioning in which the dimensions are arranged parallel to each other is called a Parallel Dimension. The combination of both the type is called as a combined dimension. In the combined dimension, the dimensions are arranged in a straight line only.
Does basic dimension have tolerance?
Basic dimensions are used to locate True Positions. There is no tolerance or deviation in the basic dimensions themselves, as they are theoretically perfect. The tolerance zone for the feature comes through the geometric tolerance shown in the feature control frame for that feature.
How are tolerance is determined?
The tolerance is the difference between the maximum and minimum limits.” This can be shown as upper and lower limits (0.2500over0. This range of allowable dimensions is the tolerance band. The larger the difference between the upper and lower limits, the larger the tolerance band, referred to as a “looser” tolerance.
Does a reference dimension have a tolerance?
Reference dimensions do not normally govern manufacturing operations (such as machining) in any way and, therefore, do not typically include a dimensional tolerance (though a tolerance may be provided if such information is deemed helpful).
Is the slight improvement over square thread?
Explanation: An acme thread is a slight improvement over square thread.
Which of the following line is a part of dimension?
Extension line It is a thin continuous line used for dimensioning an object.
Which is the most common tool used for drawing circles?
Which is the most common tool used for drawing circles? Explanation: Compass is used to draw circles. Its design is similar to the divider, except in compass there is a provision for the attachment of pencil or lead in one of the legs of the compass.
