![]() ![]() Higher values for Cm and Cmk represent better machine performance.Ĭm and Cmk describes machine capability using 20-50 consecutive measurements. Cmk represents a very short term reflection of machine performance in relation to the tolerance limits (or specification limits). Here atleast, 99.99% of the outputs from the machine are good.Cmk (and Cm) are two denotations that represent machine capability. Statistical explanation when curve stretches from +3 to -3 it is believe to occupy 99.73% and here the machine is producing 99.73% good parts. This can be represented pictorially by the plot below: Lets understand this with graphical representationĪ process where almost all the measurements fall inside the specification limits is a capable process. ![]() Any value less than this may mean variation is too wide compared to the specification or the process average is away from the target. Since Cpk uses specification limits and parts variation (sigma), we can also arrive at the yield processed and losses from the machine.Ĭpk = or >1.33 indicates that the process is capable and meets specification limits. From the Cpk value, one can derive that Machine 1 is better than 2. For instance, Machine 1 has a Cpk of 1.7 and machine 2 has a Cpk of 1.1. It can also estimate future process performance, assuming performance is consistent over time.Ĭpk is a standard index to state the capability of one process, the higher the Cpk value the better the process is. Cpk gives you the best-case scenario for the existing process. ![]() Cpk is used to estimate how close you are to a given target and how consistent you are to around your average performance. ![]() Process capability index (Cpk) is a statistical tool, to measure the ability of a process to produce output within customer’s specification limits. In simple words, it measures producer’s capability to produce a product within customer’s tolerance range. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |