engineerbecca
Electrical
I'm not sure if it would be more appropriate to approach a situation as a new revision of an existing drawing, or if it should be reissued as an altered item.
Here is the situation: I work for company A, and we are upgrading a project and drawing package originally produced by company B. In the upgrade, we are adding more functionality to the project, changing some of the configuration of hardware and software. Eventually, all instances of this project will have the upgrade. We need the drawings to match the new configuration. Should our upgraded drawings be treated as new revisions of the original drawings, or altered item drawings?
If we make them altered item drawings, it will be easier to upgrade the project (which is a lot of the work we are doing), but in order to build a new project from scratch, you will need two versions of the drawing: the original version and our altered item version. Very rarely will a project be built from scratch so implementing our changes as altered item drawings might make more sense for our purposes. But there's still an argument to be made for keeping the original title block and just bumping the rev. It will just be difficult to identify the changes when doing an upgrade.
See below for some applicable excerpts from the ASME drawing standards:
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ASME Y14.24 Types and Applications of Engineering Drawings
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6.1 Altered Item Drawing (Figs. 11 and 12)
6.1.1 Description. An altered item drawing delineates the physical alteration of an existing item under the control of another design activity or defined by a nationally recognized standard. The drawing type permits the required alteration to be performed by any competent manufacturer including the original manufacturer, the altering design activity, or a third party. It establishes a new item identification for the altered item.
6.1.2 Application Guidelines. An altered item drawing is prepared when alteration of an existing item is required. An altered item drawing shall not be prepared to modify an existing item that was developed by the design activity.
6.1.3 Requirements. An altered item drawing includes:
(a) information necessary to identify the existing item’s form, fit, function, and performance requirements prior to alteration, including the original item identification. Unless the item being altered is defined by a nationally recognized standard, this information shall be delineated on the altered item drawing, or provided by reference to a design disclosure drawing, a vendor item control drawing, or source control drawing as applicable.
(b) complete details of the alteration.
(c) a unique identifier assigned to the altered item.
(d) re-identification marking requirements; the original item identification being replaced shall be removed or obliterated, if this can be done without damage to the item. (However, microcircuit re-identification marking shall be in addition to the existing original marking and shall be visibly separate from and in no way interfere with the existing marking.)
(e) the notation ALTERED ITEM DRAWING adjacent to the drawing title block.
(f) a parts list when the alteration necessitates any additional item(s) to produce the altered item.
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ASME Y14.35-1997 Revision of Engineering Drawings
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3.7 Design Activity
An activity having responsibility for the design of an item. The activity may be government, commercial, or nonprofit organization (ASME Y14.24M).
3.7.1 Design Activity, Current. An activity currently having responsibility for the design of an item, and
the preparation or maintenance of drawings and associated documents. Current design activity could be the original activity or new activity when that responsibility is transferred from another design activity (ASME Y14.24M).
3.7.2 Design Activity, Original. An activity having had responsibility originally for the design of an item and whose drawing number, name and address (city and state), or CAGE Code is shown in the title block of the drawings and associated documents (ASME Y14.24M).
6.2 Transfer of Drawings Between Design Activities
When transferring design responsibility for a drawing from one design activity to another, the drawing number, part number, and the design activity identification, as- signed to the drawing shall not be changed. The design activity identification such as company name, address, CAGE Code, etc., as applicable, of the new design activity shall be added above the Title block by revision action. An explanatory notation may accompany the entry of the new design activity identification above the Title block.
Here is the situation: I work for company A, and we are upgrading a project and drawing package originally produced by company B. In the upgrade, we are adding more functionality to the project, changing some of the configuration of hardware and software. Eventually, all instances of this project will have the upgrade. We need the drawings to match the new configuration. Should our upgraded drawings be treated as new revisions of the original drawings, or altered item drawings?
If we make them altered item drawings, it will be easier to upgrade the project (which is a lot of the work we are doing), but in order to build a new project from scratch, you will need two versions of the drawing: the original version and our altered item version. Very rarely will a project be built from scratch so implementing our changes as altered item drawings might make more sense for our purposes. But there's still an argument to be made for keeping the original title block and just bumping the rev. It will just be difficult to identify the changes when doing an upgrade.
See below for some applicable excerpts from the ASME drawing standards:
------------------------------------------------------------------------
ASME Y14.24 Types and Applications of Engineering Drawings
------------------------------------------------------------------------
6.1 Altered Item Drawing (Figs. 11 and 12)
6.1.1 Description. An altered item drawing delineates the physical alteration of an existing item under the control of another design activity or defined by a nationally recognized standard. The drawing type permits the required alteration to be performed by any competent manufacturer including the original manufacturer, the altering design activity, or a third party. It establishes a new item identification for the altered item.
6.1.2 Application Guidelines. An altered item drawing is prepared when alteration of an existing item is required. An altered item drawing shall not be prepared to modify an existing item that was developed by the design activity.
6.1.3 Requirements. An altered item drawing includes:
(a) information necessary to identify the existing item’s form, fit, function, and performance requirements prior to alteration, including the original item identification. Unless the item being altered is defined by a nationally recognized standard, this information shall be delineated on the altered item drawing, or provided by reference to a design disclosure drawing, a vendor item control drawing, or source control drawing as applicable.
(b) complete details of the alteration.
(c) a unique identifier assigned to the altered item.
(d) re-identification marking requirements; the original item identification being replaced shall be removed or obliterated, if this can be done without damage to the item. (However, microcircuit re-identification marking shall be in addition to the existing original marking and shall be visibly separate from and in no way interfere with the existing marking.)
(e) the notation ALTERED ITEM DRAWING adjacent to the drawing title block.
(f) a parts list when the alteration necessitates any additional item(s) to produce the altered item.
------------------------------------------------------------------------
ASME Y14.35-1997 Revision of Engineering Drawings
------------------------------------------------------------------------
3.7 Design Activity
An activity having responsibility for the design of an item. The activity may be government, commercial, or nonprofit organization (ASME Y14.24M).
3.7.1 Design Activity, Current. An activity currently having responsibility for the design of an item, and
the preparation or maintenance of drawings and associated documents. Current design activity could be the original activity or new activity when that responsibility is transferred from another design activity (ASME Y14.24M).
3.7.2 Design Activity, Original. An activity having had responsibility originally for the design of an item and whose drawing number, name and address (city and state), or CAGE Code is shown in the title block of the drawings and associated documents (ASME Y14.24M).
6.2 Transfer of Drawings Between Design Activities
When transferring design responsibility for a drawing from one design activity to another, the drawing number, part number, and the design activity identification, as- signed to the drawing shall not be changed. The design activity identification such as company name, address, CAGE Code, etc., as applicable, of the new design activity shall be added above the Title block by revision action. An explanatory notation may accompany the entry of the new design activity identification above the Title block.
