Where Should Dimensions Be Placed?

Can you dimension from a centerline?

Dimensions should be given to finished surfaces or between important center lines (not to rough surfaces) wherever possible.


Dimensions should be so given that it will not be necessary for any worker to calculate, scale, or assume any dimension.


What are the functional dimensions?

Functional dimensions are used for production and inspection purposes. They should always be toleranced. 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.

Why are dimensions important in drawing?

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. Accuracy: correct values must be given.

How do you give slot dimensions?

Slots are dimensioned by giving their overall dimensions. Or, by giving the overall width and the distance between centers. The radii are indicated but the value is not given.

What is ISO dimension standard?

ISO 128 is an international standard (ISO), about the general principles of presentation in technical drawings, specifically the graphical representation of objects on technical drawings.

What are the tolerances on basic dimensions?

When features are located using BASIC dimensions by chain dimensioning, there is no accumulation of tolerance between features, because the dimensions refer to the theoretically perfect position of the feature, not the actual location of the feature within the range permitted by tolerances.

What are the 3 types of drawing dimensions?

The basic types of dimensioning are linear, radial, angular, ordinate, and arc length.

What is the minimum distance between parallel dimensions?

As shown in Fig. (b), the dimension line nearest the object outline should be spaced at 10mm away. All other parallel dimension lines should be 6 mm apart, and more if space is available. An extension line is a thin, dark, solid line that extends from a point on the drawing to which a dimension refers.

What are dimensional lines?

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.

What are the two basic types of dimensions?

There are two classifications of dimensions: size and location.Size dimensions are placed in direct relationship to a feature to identify the specific size.Location dimensions are used to identify the relationship of a feature to another feature within an object.

What are running dimensions?

Angular running dimensions are a set of dimensions measured from a zero-degree dimension in a drawing or sketch. … For example, you can create and modify angular running dimensions for a flange.

Where should dimension lines be placed?

Radial dimension lines should always be placed in the circular view of the arc, and should be drawn at an angle, never horizontal or vertical. 25. The dimension figures should be horizontal on the page, and are preceded by “R”.

What are the 8 rules of dimensioning?

Terms in this set (8)Rule 1: Dimensions should not be duplicated, nor should the same info be given in two different ways.Rule 2: Dimensions should be attached to the view that best shows the contour of the feature being dimensioned.Rule 3: … Rule 4: … Rule 5: … Rule 6: … Rule 7: … Rule 8:

Should 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 is the difference between a size dimension and a location dimension?

Size dimensions describe the size of each geometric feature. … Location dimensions show the location of each geometric feature within an object or view. Location dimensions tell the viewer where edges occur inside an object view.

What are leader lines?

A leader line is a line that establishes a connection between a graphical representation of an item and some text. A leader points to a bit of our drawing and says: ‘Oi – Look Here’ and ‘Read This! ‘.

What is the distance between two parallel lines called?

The shortest distance between two parallel lines is the length of the perpendicular segment between them. It doesn’t matter which perpendicular line you choose, as long as the two points are on the lines.

When two lines are parallel what is the distance between them?

The distance between two parallel lines in the plane is the minimum distance between any two points lying on the lines. It equals the perpendicular distance from any point on one line to the other line. In the case of non-parallel coplanar intersecting lines, the distance between them is zero.

What is the proper way of dimensioning?

Overall dimensioning should be placed outside of the smaller dimensions. When the overall is given, one of the smaller ones should be eliminated, unless it is needed for reference. In that case the dimension should be in parentheses. This dimension should be eliminated This dimension is needed.

What is double dimensioning?

4.5/5 (107 Views . 14 Votes) Dual dimensioning is the drafting practice of using multiple units of measure in a dimension in the same direction of a feature. SolidWorks and many other CAD programs support dual dimensioning.

What does it mean when a dimension is called out on a drawing?

Directly toleranced dimensions, use the tolerances called out in the drawing format, or have the tolerance included in the dimension. … They are “exact” dimensions. They are signified by placing a box around them.