DIMENSIONING RULES DIMENSIONS ARE GIVEN ON PRODUCT DESIGNS

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DIMENSIONING RULES

DIMENSIONING RULES

DIMENSIONS ARE GIVEN ON PRODUCT DESIGNS FOR MANUFACTURING AND CONSTRUCTION TO DESCRIBE THE SIZE,

DIMENSIONS ARE GIVEN ON PRODUCT DESIGNS FOR MANUFACTURING AND CONSTRUCTION TO DESCRIBE THE SIZE, SHAPE ANDLOCATION OF FEATURES ON AN OBJECT OR STRUCTURE.

dimensions The dimension may consist of: n n Numerical values Lines Symbols Notes

dimensions The dimension may consist of: n n Numerical values Lines Symbols Notes

Commands Available commands allow you to dimension linear distances: n n n Horizontal Vertical

Commands Available commands allow you to dimension linear distances: n n n Horizontal Vertical Aligned Diameter Radius.

Commands… The LEADER command allows you to place a note with an arrow and

Commands… The LEADER command allows you to place a note with an arrow and leader line pointing to the feature.

Variables There also variables that allow you to: n n Modify the appearance of

Variables There also variables that allow you to: n n Modify the appearance of dimensions These affect the height, width, style and spacing of individual components of a dimension.

Units The standard units of measurement on engineering drawings are decimal inches and metric

Units The standard units of measurement on engineering drawings are decimal inches and metric units (millimeters).

Dimensioning Units Inches or metric When all dimensions are given in inches or millimeters,

Dimensioning Units Inches or metric When all dimensions are given in inches or millimeters, a general note should appear: UNLESS OTHERWISE SPECIFIED, ALL DIMENSIONS ARE IN INCHES (OR MILLIMETERS)

Dimensioning Units Metric dimension – a “ 0” precedes the decimal point for measurements

Dimensioning Units Metric dimension – a “ 0” precedes the decimal point for measurements less than one millimeter. n Example: 0. 3, 0. 56, etc. For dimensions greater than one foot, units are shown as (‘) and (“). n Example: 9’-10 ½”

More examples: Metric n 0. 50 Inch n . 50

More examples: Metric n 0. 50 Inch n . 50

Dimensioning Circles Diameter dimensions look like this: 0 2. 5 Radius symbol looks like

Dimensioning Circles Diameter dimensions look like this: 0 2. 5 Radius symbol looks like this: n R 1. 75

Unidirectional Alignment Used in the mechanical drafting field. Unidirectional means one direction All dimension

Unidirectional Alignment Used in the mechanical drafting field. Unidirectional means one direction All dimension numerals and notes placed horizontally on the drawing. Read from the bottom of the sheet. Normally have arrowheads on the ends of dimension lines, numeral is centered in a break.

Unidirectional dimensioning Example:

Unidirectional dimensioning Example:

Aligned dimensioning Placed on architectural or structural drawings. Aligned means the dimension numerals are

Aligned dimensioning Placed on architectural or structural drawings. Aligned means the dimension numerals are lined up with the dimension lines. Dimension numerals are read at the same angle as the dimension line. Notes are placed so they read horizontally.

Aligned dimensions In architectural drafting, the dimension numeral –

Aligned dimensions In architectural drafting, the dimension numeral –

To set up dimensions Go to layers, dimension in solid RED

To set up dimensions Go to layers, dimension in solid RED

Set Dimension Style Format n Dimension Style w Modify w Adjust UNIT, TEXT and

Set Dimension Style Format n Dimension Style w Modify w Adjust UNIT, TEXT and FIT

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