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**Process average targets for LSL only.**

I have many processes where there is only a lower spec limit. The process averages are close to the spec limit. My control limits are narrow and also too close to the spec limit. Many single points of data are below the limit.

I know that I have to have the process average adjusted away from the lower spec limit, but is there a mathematical way to calculate a target for the process average? I can do it with characteristics with both a lower and an upper spec limit, centered that is.

You may ask why do this? Because statistically many of our process averages and control limits are typically closer to one of the spec limits. I have an excel worksheet that graphs the data on X bar R charts and I want to show manufacturing where, graphically, their process should be running.

Thanks