I am looking for some input from those more experienced than I on R&R.
I am trying to do an R&R study on the variation between test stands. I have 10 motors, and am using 3 different operators on 3 test stands. I am wanting to verify the flow and torque outputs from each. How would I input this data in Minitab?
@johnnyv – I would suggest that you find a different hypothesis test in which you can take continuous variable data from multiple discrete elements and evaluate for differences. Gage R&R is not the proper evaluation method.
That’s what I suspected. I’ve done some R&R in the past but nothing quite like this. Thank you for your feedback.
@johnnyv, you could do a Gage R&R on this, but it would have to be one Output (Y) at a time. Create a column for motor ID, operator, test stand, flow and torque. Minitab does offer Stat > Quality Tools > Gage Study > Create Gage R&R Study Worksheet, but it’s only for classic Gage R&R setups with parts and operators only. But you will get the idea for how to organize the worksheet. Adding test stand will increase your number of runs.
Then use Stat > Quality Tools > Gage Study > Gage R&R Study (Expanded) to run the analysis (for each output) to include the test stand.
Good luck with this.
Johnny, it seems you’re confirming variation in measurement across testing devices and using those test devices as the repeats.
Be aware that if so…you won’t get an idea of variation of each device if it’s one TEST.
Especially if it’s not time consuming, consider a gage R&R for each test stand using your 10 motors, 3 operators and go ahead and use just 2 repeat measurements for a combined 60 data points for ONE test stand. Then do the same for the other 2 and you’ll see how each “gage” varies.
One can do some interesting stats on this same data for comparison sake….but after you’re done.
@johnnyv – My original guidance may have been a bit hasty. Are you trying to do a Gage R&R on the test stands, or evaluate the differences between the test stands regarding flow and torque? If the former, then guidance from my friend @cseider would be correct. If the latter, then my original post is correct.
We are doing an R&R on each aspect of the test (torque, pressure, low flow, low flow delta p, high flow, and high flow delta p). I think when I originally posted, the requestors were unclear on what an R&R entailed. Thank you for your help.
@johnnyv – you perform a Gage R&R on a measurement system. If the tool and people are performing the same measurements (low flow, high flow for example) you only need to perform one GR&R. So from your description it looks like you need 3 GR&R’s – for torque, pressure (including the delta p’s), and flow rate.