Abstract： ASME AED-1:2018 pdf download.Aerospace and Advanced Engineering Drawings. 4.3.3 Toterances. [105. reference plane dimensions have no tolerance. The reference plane is theoretical and may be coincident with a toleranced feature. 4.3.4 Use of...

ASME AED-1:2018 pdf download.Aerospace and Advanced Engineering Drawings.

4.3.3 Toterances. [105. reference plane dimensions have no tolerance. The reference plane is theoretical and may

be coincident with a toleranced feature.

4.3.4 Use of Geometry Reference Planes. Geometry reference planes that are coincident with a part feature may be

used as a dimension origin. Geometry reference planes shall not establish datums. See FIgure 4-3

4.4 Orientation and Direction of Dimensional Requirements

Where the term AXIAL ‘ANGULAR.” or ‘RADlAL Is used to describe the orientation or direction in which a

dimensional requirement (e.g., a tolerance) is to be applied, the terms are as described below. See Figure 4-4 for an example of the use of the terms AXIAL.”“ANGULAR,” and “RADIAL.”

(a) The term “AXIAL” indicates that the dimensional requirement applies along an axis.

(b) The term “ANGULAR indicates that the dimensional requirement applies on either side of and parallel to an

angular plane emanating from the part or feature axis.

The term “RADIAL Indicates that the dimensional requirement applies along a plane or line that is constructed

normal to the part or feature axis.

4.5 Use of Single Dimension Lines or Double Arrowheads on Space-Restricted or Partial Views When space is

restricted, or when only a partial view is used, features may be dimensioned using one of the methods

depicted in Figure 4-5. When the opposite. unshown, surface is unclear, that surface shall be identified in

another view and be consIdered the dImension origin U05.

4.6 Pilot Hole Location SymboLs

When Indicating an area to be reserved for pilot holes, those areas shall be Identified on engineering drawings

using the pilot hole location symbol depicted in Figures 1-1 and 4-6 and as follows:

(a) The pilot hole location symbol Includes a cross that indicates the location of the hole. The fastener diameter is indicated in the upper’right quadrant of the symbol, where Xis the nominal diameter of the fastener that will be used for assembly or Installation. The other three quadrants shall remain blank

(hI The pilot hole location symbol shall be used to indicate pilot hole locations shown on an engineering drawing such as detail, assembly, or installation drawings. Where engineering documentation does not establish hole

specifications at the detail orassembly level of manufacture, the manufacturing information shall control when

pilot holes are included on parts and, if included, the size of the pilot holes.

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