Reasons for creating an MBOM

When working in the manufacturing environment, Siemens Digital Industries Software recommends that you create a manufacturing bill of materials (MBOM) from your engineering bill of materials (EBOM). There are several reasons for this:

• Generally, manufacturing engineers do not have write privileges on the EBOM and cannot modify it. For example, a design engineer may specify that a part is going to be purchased and sets a property value to buy. Subsequently, the manufacturing department determines that it is more economical for them to make this part. They want to change that property to make but do not have the privilege to do so.

• Assembling a part requires a structure that is different from the EBOM structure. For example, in the BOM, the exhaust manifold is part of the engine compartment. During assembly, however, the exhaust manifold must be added after the body is built onto the chassis as the exhaust pipe must be put through the bumper. This type of regrouping and adding of manufacturing-specific parts is most efficiently performed in a separate manufacturing BOM structure.

• Especially for final assembly, companies often have manufacturing parts that they consume in different MBOMs. These can only be created in a structure to which you have write access.

• There may be changes to an EBOM that should not immediately be reflected in the process structure. For example, you may want to continue manufacturing using the current parts to use up existing inventory. By using an MBOM, the manufacturing engineers have control over when the changes to the EBOM are reflected in the manufacturing process.

• Some companies do not author the EBOM in Teamcenter. It is imported from another system so that the EBOM in Teamcenter is a replication of the status of the EBOM in another system. Using an MBOM provides you with a buffer for these changes so that you can monitor and process them in a controlled manner.

Note

You cannot open an MBOM in Siemens Digital Industries Software NX.