what is the relationship between Scrap Percent and Cumulative Yield?

[jamest]

I set the routing of a item as following:
Operation Cumulative Yield
10 90.24
20 94.00
30 100.00

and I get the operation scrap percent as following
Component Operation operation Scrap Percent
2202 30 0
2206 20 6.38
2207 10 10.82

what is relationship between them?
Thank you!

 

[Krofire.com]

I am not going to go through your figures in detail to check them. Needless to say the relationship is defined within the Manuals. If you go to the OneWorld Xe (09/00) Product Data Management Manual and go to page 141 & 142 the calculation (with example) is provided there. The Planned Yield Update program can calculate this for you.

Alternatively, there is a processing option behind P3003 that controls whether the BoM Op Scrap is updated automatically from Routing updates. You should only need to set the Yield % in the Routing and let the Planned Yield Update program update the Cumulative Yield. Cumulative Yield is then used to calculate that Op Scrap on the BoM.

Hopefully this should explain your numbers.

 

[colin_gibbons]

Yeild on a routing also effects the BOM.
Where cum yeild is less than 100% the Operation Scrap % on the BOM represents
the increase in the BOM qty required to compensate.

The maths work out as follows

Operation 10 Item 2207 = (100/90.24)*100-100 = 10.82
Operation 20 Item 2206 = (100/94)*100-100 = 6.38
Operation 30 Item 2206 No operation scrap as yeild = 100%

 

[mns_cfpim]

You may be doing things backwards.
In the routing, define the Yield % as the amount of parent that will be
"lost" at that step. Then let the system calculate the cumulative yield.

Cumulative Yield accounts for the losses that will occur in subsequent
routing steps.
On the BOM, the Operation Scrap % indicates how much more of that
material you need to plan to allow for production losses and still get
the required quantity of product out of your work order. It derives from
the Cum yield.

There is another data field o the BOM (Scrap percent) that addresses how
much component will be rendered unusable in the production process. In a
metal stamping operation, for example, this could account for the "flash,
trim and knockouts" that remain after the product is produced. It
operates in addition to the routing losses.

The Routing fields (Yield % and Cumulative Yield) refer to Parent losses.


Michael N. Shapiro, CFPIM, CIRM


On Wed, 17 Mar 2004 21:03:51 -0600 jamest <[email protected]> writes:
Operation Cumulative
10 90.24
20 94.00
30 100.00

and I get
Component Operation operation Scrap
2202 30 0
2206 20 6.38
2207

what is relationship between them?
Thank you!
http://www.jdelist.com/ubb/showthreaded.php?Cat=&Board=Apps&Number=69531



Mike Shapiro, CFPIM CIRM
JDEtips Associate Editor - Manufacturing
[email protected]
Sr Mfg Consultant, Polaris ETC
[email protected]

 

[mns_cfpim]

Last spring, JDETips publeshed an article on Scrap, Shrink, and Yield. It addresses the different ways that the JDE software handles material losses, and can provide a detailed answer to your question.

Briefly, Scrap is defined for components in a BOM.

Shrink is defined for the Item in the Item Master.

Yield is defined for the parent in the Routing. You define the losses at each routing step, and the system calculates the cumulative yield. The system may also update the net effect of the routing step losses on the BOM components.

Send an e-mail to [email protected] and request a copy of the article.