MFG/PRO 9.0 User Guide Volume 3: Manufacturing - QAD.com

Set the work center labor and burden rates to zero to prevent GL
transactions from being created. You can express work center lead times
in subcontract days if load reporting is not a requirement. Otherwise, use
queue, setup, run, wait, and move times in conjunction with a work center
calendar.
You can also add one or more departments for specific suppliers for
whom capacity is a major concern. Review capacity for these departments
by printing the department load reports in the CRP module.
Yield
Depending on the manufacturing process, the percentage of a lot that is
expected to be of acceptable quality may fall below 100 percent. The
system can calculate the total yield for an item from the yield for each of
its operations using Routing Cost Roll-Up (14.13.13). The MRP planning
process uses the item yield percentage to plan additional supply.
The expected yield for an operation can be expressed as:
Yield = Acceptable Units at Operation End x 100
The total manufacturing yield for a product is determined by multiplying
the yield percentages for each of its operations.
Manufacturing Yield = Yield % for Op10 x Yield % for Op20 x...
Take care when setting yield to anything but 100%—particularly when
yield is used for multiple operations.
Example There are four operations, each having a yield of 90%. The
system calculates the item yield as 66% (90% x 90% x 90% x 90%)—an
expected loss of one in three units. If MRP plans this item and there is a
demand for 100 units, the system creates a scrap requirement for 51 units
(100 divided by 66%) and a planned order for 151 units.
Operation and item yield are different than the component scrap
percentage in product structures. Component scrap results in additional
requirements for individual components of a parent item. When an item’s
yield is less than 100%, MRP creates additional scrap requirements for
the item, causing the item and all of its components to be overplanned.
ROUTINGS/WORK CENTERS 41
Ï See “Scrap” on
page 18 for
a more detailed
description of
how the
component
scrap percentage
is used.