ASME Y14.2M PDF

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Approved for public release; distribution is unlimited. There will be no addenda or written interpretations of the requirements of this Standard issued to this edition. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.

The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability.

Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative s or person s affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals.

No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.

Department of Defense departments and agencies that participated in the review process. It consists primarily of minor changes to the text to enhance readability. The more substantial changes are as follows: a A "no terminator" option for datum targets was added to the terminator options. Suggestions for improvement of this Standard are welcome. This revision was approved as an American National Standard on September 19, Bakos, Jr. Wiegandt, Vice Chair C.

Anderson, Dimensional Control Systems, Inc. Baker, Consultant F. Burleigh, Consultant R. Chadderdon, Southwest Consultants D. Foster, L. Harding, Purdue University D. Honsinger, Consultant W.

Kaba, Boeing Commercial Airplanes K. Krulikowski, Effective Training, Inc. McCuistion, Ohio University J. Meadows, James D. Niemiec, Consultant J. Smith, Caterpillar, Inc. Wiegandt, Sandia National Laboratory B. Wilson, The Boeing Co. Campbell, Harper College J.

Dadez, Applied Geometrics, Inc. Foster, Applied Geometrics, Inc. Miles, Sr. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests.

As such, users of this Standard may interact with the Committee by proposing revisions and attending Committee meetings. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard.

Such proposals should be as specific as possible, citing the paragraph number s , the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. The request should identify the standard, the paragraph, figure or table number s , and be written as a Question and Reply in the same format as existing Cases.

Requests for Cases should also indicate the applicable edition s of the standard to which the proposed Case applies. Attending Committee Meetings. The Y14 Standards Committee regularly holds meetings or telephone conferences, which are open to the public. A more recent revision may be used, provided there is no conflict with the text of this Standard. In the event of a conflict between the text of this Standard and the references cited herein, the text of this Standard shall take precedence. ASME Y Paragraphs 2.

The thin line width shall be 0. The thick line width shall be 0. These approximate line widths are intended to differentiate between thick and thin lines and are not values for control of acceptance or rejection of drawings. All lines of the same type shall be uniform throughout the drawing. The ratio of line widths should be approximately twoto-one They consist of short evenly spaced dashes and are used to show the hidden features of an object see Figs.

The length of the dashes may vary slightly in relation to the scale of the view. Hidden lines should begin and end with a dash in contact with the visible or hidden line from which they start or end, except when such a dash would form a continuation of a visible line or when a CAD system has limitations that cannot comply with these requirements.

Dashes should join at corners, and arcs should start with dashes at tangent points see Fig. When features located behind transparent materials are depicted, they shall be treated as concealed features and shown with hidden lines. Hidden lines should be omitted when their use is not required for the clarity of the drawing. They are drawn as a pattern of straight, equally spaced, parallel lines used to indicate the cut surfaces of an object in section views see Figs.

Cut surfaces of sectional views may be identified by using section lines. Section lines are optional and may be used when necessary to distinguish individual components of an assembly or to distinguish different surface levels of a full or partial section through a part see ASME Y Lettering should not be placed in section areas. However when it is unavoidable, the section lines shall be omitted in the area for the lettering see Fig.

Section lines should be drawn at a 45 deg angle within the view [see Fig. On adjacent parts, the section lines should be drawn in the opposite direction [see Fig. For additional adjacent parts, any suitable angle may be used to make each part stand out separately and clearly [see Fig.

A suitable angle should be chosen to avoid section lines that are parallel or perpendicular to visible lines see Fig. Section lines shall not meet at common boundaries. Section lines shall be uniformly spaced a minimum of 1. Outline section lines are drawn adjacent to the boundaries only of the sectioned area, and are preferred for large areas when section lines are required, provided clarity is not sacrificed see Fig. Center lines shall start and end with long lines and shall intersect by crossing the long lines or short dashes see Fig.

The long line portion of the center line may vary in length depending on the scale of the view. Center lines shall extend uniformly and distinctly a short distance beyond the object or feature. The center line may be extended for dimensioning or for some other purpose. Center lines shall not extend through the space between views. Short center lines may be unbroken when no confusion results with other lines. The plane of symmetry is identified by placing two short parallel lines symmetry lines , drawn at right angles, crossing a center line near each end and outside the boundary of the part see Fig.

Visible and hidden lines in symmetrical views may extend past the center line when clarity is improved. Dimension lines are used to indicate the extent and direction of dimensions, and are terminated with uniform arrowheads see Figs. Arrowheads shall be drawn within the limits of the dimension line when possible [see Fig. When inadequate space is available, the dimension lines and arrowheads may be shown outside the dimensional limit [see Fig. Extension lines are used to indicate the point or line on the drawing to which the dimension applies see Figs.

They are also used to indicate the extension of a surface to a theoretical intersection see Fig. Leader lines are used to direct notes, dimensions, symbols, item numbers, or part numbers on the drawing see Figs.

A leader line should be a straight inclined line, except for a short horizontal portion extending to the center of the height of the first or last letter or digit of the note. Leader lines may consist of one or more line segments see Fig. Leaders may be drawn with a hidden line style when pointing to a hidden surface.

The horizontal portion of the leader shall not underline the note, and may be omitted entirely. A vertical line may be used at the end of the leader to group information.

When the vertical line is used, the leader line may terminate at any point on the vertical line. Cutting-plane and viewing-plane lines shall be drawn to stand out clearly on the drawing. The ends of the lines are at 90 deg, and terminated by arrowheads to indicate the direction of sight for viewing see Fig. Three forms of cutting-plane and viewing-plane lines are as follows: a evenly spaced dashes [see Fig. The long dashes may vary in length, depending on the size of the drawing [see Fig.

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