John Crist
Mechanical
- Aug 14, 2018
- 2
thread781-153223
After reading similar threads and various standards, I arrived at the following definitions. Maybe some of you have comments/recommendations.
Source Control Drawing
1. Typically used for items that are customized, or custom designed, and fabricated by a supplier upon request of one customer.
2. Requirements. Critical, known, requirements are defined. Typically, however, there are characteristics that might affect performance, but cannot be fully anticipated or specified.
3. Qualification procedure must be defined.
4. Acceptance criteria is defined on the drawing if the appropriate criteria is not obvious to a manufacturing engineer.
5. Part number is defined and is listed on the drawing.
6. Approved sources of supply and their P/N’s for each item are listed.
Vendor Item Drawing (Replaces Specification Control Drawing)
1. Typically used for commercial off the shelf components selected by a customer’s engineer for use in one or more products.
2. Requirements. Most or all public information about the item is included in a vendor item drawing, which is sufficient for the customer engineer to decide on its selection. It is also sufficient for selecting an alternate, such as in the case of the original item being obsoleted by the manufacturer. Note that a complete portrayal of the design is not generally intended or possible, and therefore the item cannot usually be reproduced using only the vendor item drawing. The manufacturer data sheet, MSDS, catalog page, etc. form most of the vendor item drawing content, including, as applicable:
a. Performance, operating and other functional characteristics
b. Schematic information
c. Mounting, interface characteristics, envelope dimensions and tolerances
d. Maintainability, reliability, life, environmental characteristics
3. Qualification procedure – not applicable.
4. Acceptance criteria is defined on the drawing if the appropriate criteria is not obvious to a manufacturing engineer.
5. Part number is defined and is listed on the drawing.
6. Suggested Sources of Supply, including the supplier’s item identification number (i.e. P/N) corresponding to our part number. The customer’s procurement activity (i.e. the buyer) without prior approval from the engineer, may procure the item from any of the suggested sources, or, from sources not listed.
7. Vendor item drawings must not be used to delineate:
a. Items requiring qualification testing in advance of a procurement action. If such testing is essential, the item is normally a candidate for a Source Control Drawing.
b. Purchased items upon which a design activity has placed requirements in addition to those normally provided by suppliers. Such items shall be delineated on some other appropriate type document such as an Altered Item Drawing, Selected Item Drawing, Source Control Drawing, Design Control Drawing, document controlled by a nationally recognized standard (e.g. ASME threaded fasteners).
Altered Item Drawing:
1. Typically used for reworking an existing item to make it useable in a different application.
2. Requirements. Delineates the alteration of an existing, documented, item, which might be under the control of another design activity. The drawing provides sufficient information for any competent, applicable, machine shop, manufacturer, etc. to successfully alter the item depicted. Depicts the item, often in a simplified manner, in its pre-altered state.
3. Qualification procedure is defined as needed.
4. Acceptance criteria is defined on the drawing if the appropriate criteria is not obvious to a manufacturing engineer.
5. Part number is defined and is listed on the drawing.
6. Part number of the item before being altered is listed on the BOM of the altered item drawing.
7. Marking/identification the altered item with its (new) part number is defined. Also defined is to remove (preferred) or to not remove the P/N corresponding to a non-altered part.
Selected Item Drawing:
1. Typically used when one or more characteristics of an existing item must be controlled to a tightened range of values, and/or the part needs to pass additional tests and/or burn-in conditioning.
2. Requirements. Delineates the selection criteria for sorting existing items into two bins -- useable and not useable.
3. Qualification procedure is defined as needed.
4. Acceptance criteria. Defined on the drawing as needed.
5. Part number is defined and is listed on the drawing.
6. Part number of the item before sorting, is listed on the BOM of the selected item drawing.
7. Marking/identification of selected item with its (new) part number is defined. Also defined is to remove (preferred) or to not remove the P/N corresponding to a non-selected part.
After reading similar threads and various standards, I arrived at the following definitions. Maybe some of you have comments/recommendations.
Source Control Drawing
1. Typically used for items that are customized, or custom designed, and fabricated by a supplier upon request of one customer.
2. Requirements. Critical, known, requirements are defined. Typically, however, there are characteristics that might affect performance, but cannot be fully anticipated or specified.
3. Qualification procedure must be defined.
4. Acceptance criteria is defined on the drawing if the appropriate criteria is not obvious to a manufacturing engineer.
5. Part number is defined and is listed on the drawing.
6. Approved sources of supply and their P/N’s for each item are listed.
Vendor Item Drawing (Replaces Specification Control Drawing)
1. Typically used for commercial off the shelf components selected by a customer’s engineer for use in one or more products.
2. Requirements. Most or all public information about the item is included in a vendor item drawing, which is sufficient for the customer engineer to decide on its selection. It is also sufficient for selecting an alternate, such as in the case of the original item being obsoleted by the manufacturer. Note that a complete portrayal of the design is not generally intended or possible, and therefore the item cannot usually be reproduced using only the vendor item drawing. The manufacturer data sheet, MSDS, catalog page, etc. form most of the vendor item drawing content, including, as applicable:
a. Performance, operating and other functional characteristics
b. Schematic information
c. Mounting, interface characteristics, envelope dimensions and tolerances
d. Maintainability, reliability, life, environmental characteristics
3. Qualification procedure – not applicable.
4. Acceptance criteria is defined on the drawing if the appropriate criteria is not obvious to a manufacturing engineer.
5. Part number is defined and is listed on the drawing.
6. Suggested Sources of Supply, including the supplier’s item identification number (i.e. P/N) corresponding to our part number. The customer’s procurement activity (i.e. the buyer) without prior approval from the engineer, may procure the item from any of the suggested sources, or, from sources not listed.
7. Vendor item drawings must not be used to delineate:
a. Items requiring qualification testing in advance of a procurement action. If such testing is essential, the item is normally a candidate for a Source Control Drawing.
b. Purchased items upon which a design activity has placed requirements in addition to those normally provided by suppliers. Such items shall be delineated on some other appropriate type document such as an Altered Item Drawing, Selected Item Drawing, Source Control Drawing, Design Control Drawing, document controlled by a nationally recognized standard (e.g. ASME threaded fasteners).
Altered Item Drawing:
1. Typically used for reworking an existing item to make it useable in a different application.
2. Requirements. Delineates the alteration of an existing, documented, item, which might be under the control of another design activity. The drawing provides sufficient information for any competent, applicable, machine shop, manufacturer, etc. to successfully alter the item depicted. Depicts the item, often in a simplified manner, in its pre-altered state.
3. Qualification procedure is defined as needed.
4. Acceptance criteria is defined on the drawing if the appropriate criteria is not obvious to a manufacturing engineer.
5. Part number is defined and is listed on the drawing.
6. Part number of the item before being altered is listed on the BOM of the altered item drawing.
7. Marking/identification the altered item with its (new) part number is defined. Also defined is to remove (preferred) or to not remove the P/N corresponding to a non-altered part.
Selected Item Drawing:
1. Typically used when one or more characteristics of an existing item must be controlled to a tightened range of values, and/or the part needs to pass additional tests and/or burn-in conditioning.
2. Requirements. Delineates the selection criteria for sorting existing items into two bins -- useable and not useable.
3. Qualification procedure is defined as needed.
4. Acceptance criteria. Defined on the drawing as needed.
5. Part number is defined and is listed on the drawing.
6. Part number of the item before sorting, is listed on the BOM of the selected item drawing.
7. Marking/identification of selected item with its (new) part number is defined. Also defined is to remove (preferred) or to not remove the P/N corresponding to a non-selected part.
