TEDs exist in the nominal model.
A TED can be a linear TED (in length units) or an angular TED (in angle units).
TEDs may only be used for the following purposes:
> An explicit linear TED of zero (0) is created when a point or line is indicated on a datum axis or a datum plane on the drawing.
> Explicit angular TEDs of zero (0°) or 90° can be created when a pattern is indicated on the drawing, in accordance with ISO 5458.
> Implicit angular TEDs of 0° or 90° are also created for the relation between a tolerance zone (such as two parallel planes or a cylinder) and the planes and axes of a datum or datum system, if no other TED angles are shown on the drawing and the specification references these datums.
> Implicit angular TEDs (360° divided by the number of tolerance zones) are created between tolerance zones that are indicated on the drawing as equally distributed on a circle.
한글 요약 정리
(j) An implied 90° angle shall apply where center lines and lines depicting features are shown on orthographic views at right angles and no angle is specified. For information on applicable tolerances for implied 90° angles, see para. 5.1.1.3.
(k) An implied 90° basic angle shall apply where center lines of features or surfaces shown at right angles on an orthographic view are located or defined by basic dimensions and no angle is specified. For information on applicable
tolerances for implied 90° basic angles, see para. 5.1.1.4.
(l) A zero basic dimension shall apply where axes, center planes, or surfaces are shown coincident on orthographic views and geometric tolerances establish the relationship between the features. On CAD models, the distance is basic when queried model distances are zero, and geometric tolerances establish the relationship between the features. For information on applicable tolerances for zero basic dimensions, see para. 5.1.1.4.
5.1.1.2 Basic Dimensions. Basic dimensions shall be indicated on the orthographic views or in the model in one of the following ways:
(a) applying the basic dimension symbol to each basic dimension. See Figure 10-1, illustrations (a) and (b).
(b) specifying on the drawing (or in a document referenced on the drawing) a general note such as “UNTOLERANCED DIMENSIONS ARE BASIC.” See Figure 10-1, illustration (c).
NOTE: When using this method, a plus/minus tolerance is not allowed via a general tolerance block or notes.
(c) implied basic dimensions of 0° and 90°. See paras. 4.1(k) and 4.1(l).
(d) specifying and querying basic dimensions on models. See ASME Y14.41.
5.1.1.3 Tolerances for Implied 90° Angles. Where an implied 90° angle applies, the applicable tolerance is the same as for all other angular features shown on the field of the drawing governed by general angular tolerance notes or general tolerance block values. For the rule regarding implied 90° angles, see para. 4.1(j).
5.1.1.4 Tolerances for Implied 90° or 0° Basic Angles. Where an implied 90° or 0° basic angle applies, the applicable
tolerance(s) are provided by a feature control frame or note that governs the location, orientation, profile, or runout of features. For rules regarding implied 90° or 0° basic angles, see paras. 4.1(k) and 4.1(l).
한글 요약 정리
| 조항 | 명 칭 | 정 의 | 예 시 |
| (j) | 묵시적 90° 각도 (Implied 90° Angle) |
정투상도에서 중심선 또는 형상이 90°로 보이지만 각도가 명시되지 않은 경우 → 90°로 간주 |
두 구멍이 수직으로 배치되어 보이지만 도면에 각도 표기가 없는 경우, 참조- 5.1.1.3 |
| (k) | 묵시적 90° 기본각 (Implied 90° Basic Angle) |
중심선 또는 표면이 90°로 보이고 기본 치수로 정의되었지만 각도 표기가 없는 경우 → 90° 기본각으로 간주 |
두 구멍 위치가 기본 치수로 정의되어 있고 직각으로 보이지만 각도 미기재, 참조- 5.1.1.3 |
| (l) | 0 기본 치수 (Zero Basic Dimension) |
중심선, 축, 면이 일치(coincident) 하도록 나타났고 기하공차가 관계를 정의한 경우, 거리 = 0 기본치수로 간주 |
두 축이 일치하고 위치공차로 정밀도를 정의한 경우, 참조- 5.1.1.3 |
(j) Implied 90° Angle (묵시적 90도 각도)
(k) Implied 90° Basic Angle (묵시적 90도 기본각)
(l) Zero Basic Dimension (0 기본 치수)
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