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Metric Dimensioning Guide
From Draftsperson.net
| Revision as of 09:58, 5 June 2006 Allan (Talk | contribs) ← Previous diff |
Current revision Allan (Talk | contribs) |
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| Written by Allan | Written by Allan | ||
| Created 2-July-2004 | Created 2-July-2004 | ||
| - | ==Lines== | + | ===Lines=== |
| *Projection lines indicate extremities of a dimension. A gap of 1mm is generally drawn from the object to the start of the projection line. An extension of 2mm is generally drawn past the dimension line. | *Projection lines indicate extremities of a dimension. A gap of 1mm is generally drawn from the object to the start of the projection line. An extension of 2mm is generally drawn past the dimension line. | ||
| *Dimension lines run between the projection lines. They generally terminate with and arrowhead or tick. Arrowheads are usually 3x1mm and ticks, 2mm long. | *Dimension lines run between the projection lines. They generally terminate with and arrowhead or tick. Arrowheads are usually 3x1mm and ticks, 2mm long. | ||
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| *15 x scale is the formula for working out the gap between dimension lines and the object. | *15 x scale is the formula for working out the gap between dimension lines and the object. | ||
| - | ==Notation== | + | ===Notation=== |
| *Dimensions are usually in millimetres (millimeters). Place a note in the title block stating "ALL DIMENSIONS IN mm" to avoid the need to specify "mm" after every number. | *Dimensions are usually in millimetres (millimeters). Place a note in the title block stating "ALL DIMENSIONS IN mm" to avoid the need to specify "mm" after every number. | ||
| *Dimensions lest than 1 should lead with a "0" before the decimal point. Example: 0.5 | *Dimensions lest than 1 should lead with a "0" before the decimal point. Example: 0.5 | ||
| Line 39: | Line 18: | ||
| *Where the "plus minus" symbol appears after a number, the number has been rounded of to the nearest whole number. Generally this is not required, unless in clears up why a dimension string does not close off. | *Where the "plus minus" symbol appears after a number, the number has been rounded of to the nearest whole number. Generally this is not required, unless in clears up why a dimension string does not close off. | ||
| - | ==Alignment== | + | ===Alignment=== |
| *There are two common methods of aligning notations, "Aligned" is the most common. | *There are two common methods of aligning notations, "Aligned" is the most common. | ||
| # Aligned: The dimensions are parallel to the dimension line. Dimensions can always be readable either from the bottom or the right of the drawing. | # Aligned: The dimensions are parallel to the dimension line. Dimensions can always be readable either from the bottom or the right of the drawing. | ||
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| [[Category:Drafting Standards]] | [[Category:Drafting Standards]] | ||
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| + | {{Template:BottomPage}} | ||
Current revision
Written by Allan Created 2-July-2004
Lines
- Projection lines indicate extremities of a dimension. A gap of 1mm is generally drawn from the object to the start of the projection line. An extension of 2mm is generally drawn past the dimension line.
- Dimension lines run between the projection lines. They generally terminate with and arrowhead or tick. Arrowheads are usually 3x1mm and ticks, 2mm long.
- Thin linework should be used of dimension and projection lines.
- For dimensions that cannot be drawn to there true termination point, the free end is terminated in a double arrowhead.
- 15 x scale is the formula for working out the gap between dimension lines and the object.
Notation
- Dimensions are usually in millimetres (millimeters). Place a note in the title block stating "ALL DIMENSIONS IN mm" to avoid the need to specify "mm" after every number.
- Dimensions lest than 1 should lead with a "0" before the decimal point. Example: 0.5
- Angular dimesions are specified in decimal degrees, degrees and minutes or degrees minutes and seconds. Example: 10.5° - 10°30' - 10°30'30"
- When specifying an overall dimension, one non-critical component dimension should be omitted. Where all component dimesions must be specified, and overall lenght should be specified as an auxiliary dimension.
- Auxiliary dimensions should be shown in brackets or noted "REFERENCE".
- Dimensions that are not to scale are underlined or noted "NTS".
- Where the "plus minus" symbol appears after a number, the number has been rounded of to the nearest whole number. Generally this is not required, unless in clears up why a dimension string does not close off.
Alignment
- There are two common methods of aligning notations, "Aligned" is the most common.
- Aligned: The dimensions are parallel to the dimension line. Dimensions can always be readable either from the bottom or the right of the drawing.
- Unidirectional: All dimensions are written horizontally.
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