Shawn97701
2nd October 2009, 08:31 PM
Hello All,
Our team is really focusing towards the LEAN method but now Management wants to know yields... Process yields, etc....
The only interesting thing that I have to work with is our manufacturing team records all of the issues / rejections using the 4 M's...
For example, a unit is manufactured and had 4 documented issues:
(1) Broken component - Matieral
(1) Computer didnt work to test it - Machine
(1) Label misaligned - Method
(1) Screw not tight - Method
Any ideas / or suggestions on how to turn this into a process measurement?:frust:
Miner
2nd October 2009, 08:54 PM
Do you have records like this for every unit, or only on defective units?
Either way, you have several options:
Using this type of defect data, you can calculate Defects Per Unit (DPU) and track them using a c or u chart.
You can roll this up to defective data and calculate percent defective and track using a p or np chart. 1 - p would provide yield data for that operation.
If you have data for multiple operations, you can calculate a Rolling Throughput Yield (RTY).
You can analyze the defects using a Pareto chart to prioritize corrective action.
brahmaiah
3rd October 2009, 08:52 AM
Hello All,
Our team is really focusing towards the LEAN method but now Management wants to know yields... Process yields, etc....
The only interesting thing that I have to work with is our manufacturing team records all of the issues / rejections using the 4 M's...
For example, a unit is manufactured and had 4 documented issues:
(1) Broken component - Matieral
(1) Computer didnt work to test it - Machine
(1) Label misaligned - Method
(1) Screw not tight - Method
Any ideas / or suggestions on how to turn this into a process measurement?:frust:
You can measure the above failures by following methods;
1.Broken components: % breakage or cost of broken components
2.(Computer failure): 2a) Average time(days) between failure and
2b) Computer downtime in Hrs.per month
3.Label misalignment:No of failures per 100 labels (%)
4.Screw not tight :No of failures per 100 screws(%)
V.J.Brahmaiah
qusys
3rd October 2009, 06:55 PM
You could calculate how well you reach the results vs planned one , unit per unit.
You should count scrap or defective pieces, analyzing the causes and fix the issue.
Hello All,
Our team is really focusing towards the LEAN method but now Management wants to know yields... Process yields, etc....
The only interesting thing that I have to work with is our manufacturing team records all of the issues / rejections using the 4 M's...
For example, a unit is manufactured and had 4 documented issues:
(1) Broken component - Matieral
(1) Computer didnt work to test it - Machine
(1) Label misaligned - Method
(1) Screw not tight - Method
Any ideas / or suggestions on how to turn this into a process measurement?:frust:
