Numbering Procedures for APO 2.5m and 3.5m Drawings and Engineering/Drafting Documents

Effective February 26, 2006

Document part numbers are to consist of a 7 character long "base numbe,r" which is coded to provide information about the part's intended first use. The part number becomes complete and unique only with the addition of a revision number.

A single complete number consists of the base number plus the revision. It can be used to identify any given computer file, drawing, or other engineering document, and (as applicable) the part itself. It is functionally equivalent for all forms of the item being identified (electronic file, hardcopy, part). It is also to be unique from all other documents or parts.

On hardcopy documents, the revisions are identified by a unique revision character on the document. Computer file names of documents, including CAD files, shall use the same designations as the drawings, but incorporate the document revision in the file name by following the base number with an "R," then the revision character for the specific revision.

Example of a "base number": 25CSA01

Example computer file name, with a "base number" plus revision: 25CSA01RC

Example of a complete hardcopy Drawing Number: 25CSA01 Rev. C

CAD and other computer files using this convention will be able to freely apply the unique filename extensions that are assigned by the specific software.

Example of a computer filename: 25CSA01RC

Example of a computer filename with a "Solidworks" filename extension: 25CSA01RC.SLDPRT

PART NUMBER CONVENTION

TTSCC##RN

TT = Telescope Designation:

For Example: 25 = 2.5 meter telescope; 35 = 3.5 meter telescope

S = Main System ID: (The Main System ID is used to identify the general "system" to which the document/part applies)

For Example:

O = Telescope Optics

S = Telescope Structure

C = Control/Positioning Systems

E = Enclosure

A = Ancillary Equipment

CC = Subassembly ID: (The Subassembly ID is used to further identify the specific sub-system, based on the sub-assembly of which the document/part is a member)

For Example:

SA = Secondary Axial Actuator Components

ST = Secondary Transverse Actuator Components

SF = Secondary Frame Components

SM = Secondary Mirror Components

SZ = Secondary Assemblies (or sub-assemblies)

## = Sequentially Applied Alphanumeric Characters: (to ensure a unique number for each new document/part).

Sequentially assigned from 01 to 99; then from aa to zz (lower case, excluding use of the letter "O") as needed.

Note: The letter "O" is not used, to avoid confusion with the number "0" (zero).

Revision Designation: (primarily used as an abbreviation for "Revision" in computer generated file names)

R = "Revision"

N = Revision Number or Letter (Revision characters are to begin with "0" (zero) to indicate a new release and any revision thereafter is to be an alphabetical character (upper case) applied in ascending order.)

0 = New

A through Z (Capitals) applied in sequential order, excluding "O".

Example: a new release is designated Rev 0; subsequent changes are Rev A, Rev B, etc.

Note: The letter "O" is not used, to avoid confusion with Rev. "0" (zero).

General Notes:

1. Additional Designations can be added to any of the coded identifiers (TT, S, or CC) as needed.

2. Released part numbers are not to be redefined or reused, including the following:

a. already published ID's of any category

b. any previously released part or document number, including all released revisions

Questions contact Larry Carey/University of Washington