What is the difference between mcl lcl and usl lsl

If you are the one who get confused, take a look down. The USL or upper specification limit is the upper limit set by your customer requirements for your product and service. LSL or lower specification limit is lower limit set by your customers requirements for your product or service. The UCL or upper control limit and LCL or lower control limit are limits set by your process based on the actual amount of variation of your process. There are vampires. Like Like. David, In our company, we have a customer specs which our design engineer made tightier which we consider our internal specs.

No way. Absolutely not. The difference between SL specification limits and CL control limits is much more than sitaxis. SL say what you want, and CL say what you get. You can fix what you want, but you cannot fix what you get. Specification limits are supposed to define the range where a characteristic of a product can be and still be usable. Then you make the production and what you get?

Assuming that the process is in control, you get a batch of parts within control limits which, depending on the process capability, can also be within specification limits or not. You will need to make a lot of investigations about the process and take improvement actions on it to try to get what you want, and then you still have to verufy if you actually got what you wanted.

Thank you very much for your help, Gabriel!!! So, the best to do if you have external suppliers, is to give them our SL, and checking with their CL, in order to avoid as much defects as possible. Then, for your internal process, you put the SL for your customers. Normally, that way, you will improve… But it depends if you have a quality control available at the very start of your internal process….

Please Sign in Register. This topic has 13 replies, 7 voices, and was last updated 17 years, 5 months ago by Edwards. Viewing 14 posts - 1 through 14 of 14 total. April 19, at am Followers 0. Recommended Posts. Posted September 27, UCL -Upper control limit which you get from your process LCL - Lower control limit which you get from your process Example- You are required to produce a shirt of 42 size.

Now to give you a real time scenario:- We conduct mystery shoppers at our test centers across India to see if the centers are adhering to the required quality and security standards. Link to comment Share on other sites More sharing options Posted October 14, Dear Anis, Natural process limits are known by several names in the literature: natural process variation, normal process variation, and natural tolerance.

Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community. Register a new account. Sign in Already have an account? How do you calculate control limits? Multiplying that number by three.

What is lower specification limit? This is also known as a lower spec limit or lower specific limit representing the minimum acceptable value of a variable. What is control limit in statistics? How is USL calculated? A capable process is one where almost all the measurements fall inside the specification limits. Based on the normal distribution, the percent of product that would fall out of specification can be calculated. How do you know if a process is in control?

Three characteristics of a process that is in control are: Most points are near the average. A few points are near the control limits. No points are beyond the control limits.