Question:
Hi Experts,
I am working on a scenarion in Process Industry where we have Master Inspection Characteristics like Concentration, Purity etc, having some values of Lower Control Limit, Upper Control Limit specific for each Product i.e. Material.
Becuase of this we need to maintain seperate MIC for each Product,
Can't we have something like this
MIC will remain as Concentration only without any Control limits
but when it is attached to some Materials there we define the limits.
This way we can avoid making bulk of MIC.
Expecting suggestions...from EXPERTS
_________________
Thanx & Regards
vdheeraj...
Answer:
am not an expert but i'll give it a shot
You don't need to maintain the characteristic completely. So no need to enter the upper and lower limits in the MIC itself.
When you attach the MIC to the task list of any material, it will automatically ask you for the upper and lower limits
Hope this helps,
Tanuj
Answer:
..... this just came to mind (can't help it, am a bit slow) . :oops: ....
the disadvantage of the this solution would be, since the MIC is not completely maintained, it would not be referenced but just copied to the task lists. Consequently you will not be able to do an automatic replacement in-case that is required in the future.
Regards,
Tanuj
Answer:
I believe that the control limits are calculated based on the control chart and the number of std. deviations defined for the particular control chart being used. Since the control charts can be defined to be material specific, each material gets it's own control limits calculated once enough data points have been collected.
The control limits you see displayed in the inspection characteristic are NOT functional. If you go into an inspection characteristic, go to the quant data, and use F1 on one of the Pairs of limits, you'll get the following info:
First Lower Specification Limit
Lower limiting value of a user-specified limit, for example, a warning limit.
Use
The system does not use the contents of this field. This field provides a place to store a user-specified limit value that is relevant for a quantitative characteristic.
Hope this helps you.
Craig
Answer:
Hi Craig,
The purpopse is to avoid creating large no. of MIC's actualli we are i Process industry. in this case for e.g. PURITY is to be measured for e.g. 10 materials and as there is in process inspection we measure it at different vessels/ locations and the UCL nad LCL are different at each stage .
so if I create a MIC named PURITY (completeely maintained)
and either overwrite the LCL and UCL in the reciepe or maintain a material specification for it . my problem still remains unresolved , How to maintain different LCL and UCL for same material processed at different vessels.
Material spec can't incorpoprate Vessel or so..
Pls suggest.
_________________
Thanx & Regards
vdheeraj...
Answer:
Hai Dheeraj
MIC is such that, we can use it again & again for diff materials & diff inspection lots. While creating MIC u have to select either UCL or LCL or both & data sholud be entered.
While using MIC u can change the specs depending on the material ur inspecting.
Hence one MIC for one characteristic for all materials suffices
thanks
Vidyadhar
Answer:
Hello Dheeraj
You are getting all sort of replies since you started with one MIC with different values for different materials (your first post) but subsequently changed it to one MIC with different values for same material in different Vessels
(1) Can you explain how, for the same MIC, you will have different UCL and LCL in different Vessels ? (Different actual values are acceptable but how come different Limits ?)
(2) In case they are different Production processes, then definitely you will have different Routings (or Alternate Operations)
Incase of (2), you will be able to attach the same MIC with different Control Limits for each Routing / Operation
Or Is my understanding of your requirement wrong ... ?
Answer:
Maniaz,
let me explain you the situation we have a Chemical being manufactured which is processed at different vessels..
so when it is in vessel 1 than concentarion should be . e.g. 34 - 36%
in vessel 2 it should be 44 - 45 %
and finally it should be 48 - 51 %
so in MIC i want the Upper spec limit and lower spec limit as above
I am sorry for using LCL and UCL name while posting as it should be UPPER SPEC . LIMIT AND LOWER SPEC. LIMIT...
_________________
Thanx & Regards
vdheeraj...
Answer:
Hello
The requirements are some what clear now
(1) Are you using In-Process Inspection ?
(2) Are you having one Operation in the Receipe / Order for each Vessel?
(3) Are you attaching MICs to each Operation ?
Or Are you using Vessel as an Inspection Point ?
Answer:
Yes.. big difference between UCL&LCL and Upper Tol. limit and Lower Tolerance limit!
Since you described what you did, I might suggest setting up different production versions for the material. A different version for each vessel the material can be manufactured in. Use the same MIC in each receipe. Your specs are then set within each receipe.
Control charts are created then on material/task list basis. Thus you'll wind up with a control chart for each vessel/material combination.
From your description, it sounds like this might be a two stage process? Doe the material move from vessel 1 to vessel 2 during the production process? If so, you should have two separate operations for this and you should be able to use the same MIC in each operation, each with their own spec range. These would of course be 03 inspection lots.
I assume though, that upon GR from production, the final material spec is the same regardless of the vessel used for manufacturing. So you would set these specs in the class, which should then be copied into your inspection lot if your using both inspec with mtrl and insp. with task list.
Craig
Answer:
Thans Craig,
I will work on your suggestion and let you know how it works...
Thanks again for the detail suggestion
_________________
Thanx & Regards
vdheeraj...