Obviously I'm headed in the direction of building an Xbar and R chart to use real-time.

When?

JackHughs wrote on Feb 23^rd, 2014 at 11:57am:


My objective is to control every step of the process from rendering alloy to counting the score.  Hence in casting to do an Xbar and R (mean and range) chart gives an item by item indication of how accurately each bullet has been cast - to identify immediately a) that there has been a variation in the process and then to b) to allow a correction to be made.

When?  One step at a time.  I still need to install thermocouples in my lead pot (I have the controllers); I need to finish my data logging program in LabVIEW (it is now installed on the computer next to my casting/lubing stations); and I need to work on an automatic weighing of each bullet after being cast.

I did start casting, emptying the mould, refilling and while waiting to cool weighing each bullet.

Although subjective, it was interesting to see my slight variations in process affect the weights.  300gr +/- 1 grain, often less was observed.  I need to connect the dots and tighten up MY variations to get down to say +/- 0.2 gr.