Give me a good definition of Process Capability…
Six Sigma – iSixSigma › Forums › Old Forums › General › Give me a good definition of Process Capability…
- This topic has 6 replies, 7 voices, and was last updated 16 years, 4 months ago by
Griswold.
-
AuthorPosts
-
April 10, 2006 at 1:13 pm #43035
I am going to do a presentation at our plant on process capability. I’m looking for a good, solid, short definition.
I wanna hear yours!
(please reference any book that you may have quoted)
Thanks,
-MikeA
0April 10, 2006 at 1:26 pm #136174A little pessimistic, but how about:
“How bad your process sucks.” (That’s my own…you can quote me if you want.)0April 10, 2006 at 1:44 pm #136178
Paul RichardsonParticipant@Paul-RichardsonInclude @Paul-Richardson in your post and this person will
be notified via email.Mike, how about this one. A little longer that the previous suggestion, but more technically accurate.
Process capability compares the range, or natural tolerance (NT), of an in-control or consistent process to the specifications. The natural tolerance can be described by thinking of the bellshaped distribution. The natural tolerance would be the +/- 3ó range that includes 99.73% of the data. If the natural tolerance is less than the specification range, then the process is said to be capable of meeting requirements. The tolerance is simply the upper specification limit minus the lower specification limit. A process can either be capable or not. Even though a process may be capable, it may not be meeting requirements.
Paul0April 10, 2006 at 1:45 pm #136179
OpenballParticipant@OpenballInclude @Openball in your post and this person will
be notified via email.Process capability measures the (potential) capability of a process to fulfill operational specifications.
0April 11, 2006 at 12:57 am #136212I like Paul definition. But can I know further how you calculate the natural tolerance? If USL minus the LSL is your natural tolerance, what is the spec range? I just want to know how we define the process is capable through this NT. Previously, I just take the Cpk or Ppk as long as it less than 1.33, I consider it’s not capable enough. Please advice. I’m under training BB trying to get certification. I’ll appreciate your help. TQ
0April 11, 2006 at 1:43 am #136214
Zero_CoolMember@Zero_CoolInclude @Zero_Cool in your post and this person will
be notified via email.TwoCents,
Have you given your quote with your yellow lit light saber open and in attack mode?? :-)) Carefull with the battery, it might run out of charge.
Zero_Cool0April 11, 2006 at 1:59 am #136216
GriswoldParticipant@chipgiiiInclude @chipgiii in your post and this person will
be notified via email.Paul stated it very well. Process Capability, when stable, is the random variation around some centerpoint that the process actually is. Spec limits is usually something the customer establishes. Whether are not the process is within those spec limits is another thing. If they are not, you need to get them there, or the customer goes somewhere else.
0 -
AuthorPosts
The forum ‘General’ is closed to new topics and replies.