ASME ANSI Y14.18M:1986 pdf free download

ASME ANSI Y14.18M:1986 pdf free download OPTICAL PARTS
1.1 Scope
This Standard establishes practices for pictorialrepresentation and specification definitions on draw-ings for optical parts.
1.2 Application
Because of the unique nature of optical componentsand their manufacturing techniques， standard draw-ing practices do not always apply. In the event of aconflict with such standards, the requirements statedin this document shall take precedence.
1.3 Applicable Documents
1.3.1 References in Text
When the following American National Standardsreferred to in this Standard are superseded by a revi-sion approved by the American National StandardsInstitute, Inc., the revision shall apply.
American National Standards
ANSI PH3.617-1980，Definitions，Methods ofTesting, and Specifications for Appearance Im-perfections of Optical Elements and AssembliesANSI Y14.1-1980,Drawing Sheet Size and FormatANSI Y14.2M-1979, Line Conventions and Letter-ing
ANSI Y14.5M-1982，Engineering Drawing andRelated Documentation Practices, Dimensioningand Tolerancing
ANSI Y14.36-1978，Engineering Drawing andRelated Documentation Practices，Surface Tex-ture Symbols 0.S. Military Standards and Specifications
MIL-STD-1241,Optical Terms and DefinitionsMIL-G-174,Optical Glass
1.3.2 Other Applicable References.Appendix Aprovides a list of additional references related to opti-cal parts.
1.4 Measurement and Production Methods
This Standard does not define measurement or pro-duction methods for producing optical parts. Whenspecial processing is necessary to meet design require-ments,this is specified in an advisory note on thedrawing. Such notes are used in some figures for ex-ample only.
1.5 Units
The International System of Units (S1) is featured inthis Standard. It should be understood that U.s.cus-tomary units could equally have been used withoutprejudice to the principles established.
1.6 Definitions
Unless otherwise specified，definitions for termi-nology used in this standard are in accordance withMIL-STD-1241.
1.7 Advisory Notes
An advisory note is reference information.
2.1 Introduction
The mechanical view of an optical element typicallyfollows standard drawing practice except as noted be-low. Individual optical elements shall be presented inthe orientation that they maintain in their optical sys-tem drawing (see para.2.8.3).
2.2 Single Lens Elements
2.2.1 Views. A single lens is depicted by a singlesectional view (see Fig.1). Hidden lines (backedges)are omitted.Glass hatching in accordance with ANSIY14.2M is optional. Lenses of unusual configurationare depicted using as many views as are required.2.2.2 Dimensions.Sufficient dimensions and as-sociated tolerances shall be given in accordance withANSI Y14.5M to physically describe the item with re-spect to perimeter and thickness. Surface radii shouldbe labeled and the information tabulated.
2.2.3 Surface Information.All surface informa-tion shall be given either specifically or by default to ti-tle block information (see ANSI Y14.1).The surfacesshall be labeled and the information tabulated.
2.3 Prisms
2.3.1 Views.As many views as required to depictthe necessary details shall be used to represent a prism.A sample prism drawing is shown in Fig.2.
2.3.2 Dimensions. Sufficient dimensions and as-sociated tolerances shall be given in accordance withANSI Y14.5M to describe the shape and volume ofthe prism. Additional tolerancing is discussed inSection 3.
2.3.3 Surface lnformation.All surface informa-tion shall be given either specifically or by default to ti-tle block information (see ANSI Y14.1).The surfacesshall be labeled and the information tabulated.