DDP- Dimension Guideline
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16 terms
Terms | Definitions |
|---|---|
 Dimensions should NOT be duplicated, or the same information given in two different ways. | Dimensions should NOT be duplicated, or the same information given in two different ways. |
| No unnecessary dimensions should be used - only those needed to produce or inspect the part. | No unnecessary dimensions should be used - only those needed to produce or inspect the part. |
| Dimensions should be attached to the view that best shows the contour of the feature to be dimensioned. | Dimensions should be attached to the view that best shows the contour of the feature to be dimensioned. |
| Whenever possible, avoid dimensioning to hidden lines and features. | Whenever possible, avoid dimensioning to hidden lines and features. |
| Avoid dimensioning over or through the object. | Avoid dimensioning over or through the object. |
| A dimension should be attached to only one view; for example, extension lines should not connect two views. | A dimension should be attached to only one view; for example, extension lines should not connect two views. |
| Whenever possible, locate dimensions between adjacent views. | Whenever possible, locate dimensions between adjacent views. |
| Avoid crossing extension lines, but do not break them when they do cross. | Avoid crossing extension lines, but do not break them when they do cross. |
| Whenever possible, avoid sending extension lines through object views. | Whenever possible, avoid sending extension lines through object views. |
| In general, a circle is dimensioned by its diameter and an arc by its radius. | In general, a circle is dimensioned by its diameter and an arc by its radius. |
| Holes are located by their centerlines, which may be extended and used as extension lines. | Holes are located by their centerlines, which may be extended and used as extension lines. |
| Holes should be located and sized in the view that shows the feature as a circle. | Holes should be located and sized in the view that shows the feature as a circle. |
| Do not cross a dimension line with an extension line, and avoid crossing dimensions with leader lines. | Do not cross a dimension line with an extension line, and avoid crossing dimensions with leader lines. |
| Leader lines point toward the center of the feature, and should not occur horizontally or vertically. | Leader lines point toward the center of the feature, and should not occur horizontally or vertically. |
| Dimension numbers should be centered between arrowheads, except when using stacked dimensions, and then the numbers should be staggered. | Dimension numbers should be centered between arrowheads, except when using stacked dimensions, and then the numbers should be staggered. |
| Concentric circles are dimensioned in the longitudinal view, whenever practical. | Concentric circles are dimensioned in the longitudinal view, whenever practical. |
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